build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter (#2711

)

Bumps [com.google.cloud:google-cloud-spanner-pgadapter](https://github.com/GoogleCloudPlatform/pgadapter) from 0.40.0 to 0.42.2.
- [Release notes](https://github.com/GoogleCloudPlatform/pgadapter/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/pgadapter/blob/postgresql-dialect/CHANGELOG.md)
- [Commits](v0.40.0...v0.42.2)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-spanner-pgadapter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>