Bump com.google.cloud:spring-cloud-gcp-dependencies from 5.5.1 to 5.6.0

Bumps [com.google.cloud:spring-cloud-gcp-dependencies](https://github.com/GoogleCloudPlatform/spring-cloud-gcp) from 5.5.1 to 5.6.0.
- [Release notes](https://github.com/GoogleCloudPlatform/spring-cloud-gcp/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/spring-cloud-gcp/blob/main/CHANGELOG.md)
- [Commits](GoogleCloudPlatform/spring-cloud-gcp@v5.5.1...v5.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -50,7 +50,7 @@
             <dependency>
                 <groupId>com.google.cloud</groupId>
                 <artifactId>spring-cloud-gcp-dependencies</artifactId>
-                <version>5.5.1</version>
+                <version>5.6.0</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>