Firestore: Declare encoding as utf-8 in pb2 files (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/firestore/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:6db0735b0d3beec5b887153a2a7c7411fc7bb53f73f6f389a822096bd14a3a15
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/firestore/artman_firestore.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/write.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/write.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/common.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/common.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/firestore.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/firestore.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/document.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/document.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/query.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/query.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto.
synthtool > Replaced 'from google.cloud import firestore_v1beta1' in tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py.
synthtool > Replaced 'client = firestore_v1beta1.FirestoreClient' in tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py.
synthtool > Running generator for google/firestore/artman_firestore_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/write.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/write.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/common.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/common.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/firestore.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/firestore.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/document.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/document.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/query.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/query.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto.
synthtool > Replaced 'from google.cloud import firestore_v1' in tests/unit/gapic/v1/test_firestore_client_v1.py.
synthtool > Replaced 'client = firestore_v1.FirestoreClient' in tests/unit/gapic/v1/test_firestore_client_v1.py.
.coveragerc
.flake8
MANIFEST.in
noxfile.py.j2
setup.cfg
synthtool > Replaced 'GOOGLE_APPLICATION_CREDENTIALS' in noxfile.py.
Running session blacken
Creating virtualenv using python3.6 in .nox/blacken
pip install black
black docs google tests noxfile.py setup.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/firestore_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/transports/firestore_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/common_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/document_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/firestore_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/common_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/firestore_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/query_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/document_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/write_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/write_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/query_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/firestore_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/transports/firestore_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/common_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/common_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/document_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/firestore_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/firestore_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/document_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/query_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/firestore_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/query_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/write_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/write_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/noxfile.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/tests/unit/gapic/v1/test_firestore_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/firestore_pb2.py
All done! ✨ 🍰 ✨
31 files reformatted, 75 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.