build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter (#3934)

Bumps [com.google.cloud:google-cloud-spanner-pgadapter](https://github.com/GoogleCloudPlatform/pgadapter) from 0.51.1 to 0.52.0.
- [Release notes](https://github.com/GoogleCloudPlatform/pgadapter/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/pgadapter/blob/postgresql-dialect/CHANGELOG.md)
- [Commits](v0.51.1...v0.52.0)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-spanner-pgadapter
  dependency-version: 0.52.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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samples/java/spring-data-jpa/pom.xml

@@ -55,7 +55,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-pgadapter</artifactId>
-      <version>0.51.1</version>
+      <version>0.52.0</version>
     </dependency>
     <!-- Add Spanner Hibernate tools for access to the batch compatible bit-reversed sequence generator. -->
     <dependency>