build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter (GoogleCloudPlatform#3248)

Bumps [com.google.cloud:google-cloud-spanner-pgadapter](https://github.com/GoogleCloudPlatform/pgadapter) from 0.47.0 to 0.47.1.
- [Release notes](https://github.com/GoogleCloudPlatform/pgadapter/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/pgadapter/blob/postgresql-dialect/CHANGELOG.md)
- [Commits](GoogleCloudPlatform/pgadapter@v0.47.0...v0.47.1)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-spanner-pgadapter
  dependency-version: 0.47.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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samples/java/jdbc/pom.xml

@@ -56,7 +56,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-pgadapter</artifactId>
-      <version>0.47.0</version>
+      <version>0.47.1</version>
     </dependency>
     <!-- [END pgadapter_and_jdbc_dependency] -->
     <dependency>