chore: release 1.15.1 (googleapis#52)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py [ci skip]

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release 1.15.0 (googleapis#40)

* updated CHANGELOG.md [ci skip]

* updated setup.py [ci skip]

* Update CHANGELOG.md

Tidy commit summaries

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: larkee <[email protected]>

chore: release 1.14.0 (googleapis#2)

* updated CHANGELOG.md [ci skip]

* updated setup.py [ci skip]

chore(spanner): release 1.13.0 (#9731)

* chore(spanner): release 1.13.0

* address PR comments

chore(spanner): release 1.12.0 (#9530)

chore(spanner): release 1.11.0 (#9473)

Release 1.10.0 (#8767)

Release spanner-1.9.0 (#8009)

Release 1.8.0 (#7487)

Release spanner 1.7.1 (#6929)

* Release 1.7.1