build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter (#1315

)

Bumps [com.google.cloud:google-cloud-spanner-pgadapter](https://github.com/GoogleCloudPlatform/pgadapter) from 0.27.1 to 0.28.0.
- [Release notes](https://github.com/GoogleCloudPlatform/pgadapter/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/pgadapter/blob/postgresql-dialect/CHANGELOG.md)
- [Commits](v0.27.1...v0.28.0)

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

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

benchmarks/latency-comparison/java/pom.xml

@@ -47,7 +47,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-pgadapter</artifactId>
-      <version>0.27.1</version>
+      <version>0.28.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>