chore(deps): update dependency google-cloud-bigquery-migration to v0.8.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-bigquery-migration	==0.7.2 -> ==0.8.0

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Release Notes

googleapis/python-bigquery-migration

v0.8.0

Compare Source

Features

• Add support for google.cloud.bigquery_migration.__version__ (8f180ec)
• Add typing to proto.Message based class attributes (8f180ec)

Bug Fixes

• Add dict typing for client_options (8f180ec)
• deps: Require google-api-core >=1.34.0, >=2.11.0 (61bc618)
• Drop usage of pkg_resources (61bc618)
• Fix timeout default values (61bc618)

Documentation

• samples: Snippetgen handling of repeated enum field (8f180ec)
• samples: Snippetgen should call await on the operation coroutine before calling result (61bc618)

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