[Gradle] Bump gradle-wrapper from 9.5.1 to 9.6.0 in /java/pekko-cluster

Bumps [gradle-wrapper](https://github.com/gradle/gradle) from 9.5.1 to 9.6.0.
- [Release notes](https://github.com/gradle/gradle/releases)
- [Commits](gradle/gradle@v9.5.1...v9.6.0)

---
updated-dependencies:
- dependency-name: gradle-wrapper
  dependency-version: 9.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

java/pekko-cluster/gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=bafc141b619ad6350fd975fc903156dd5c151998cc8b058e8c1044ab5f7b031f
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-bin.zip
+distributionSha256Sum=bbaeb2fef8710818cf0e261201dab964c572f92b942812df0c3620d62a529a01
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.0-bin.zip
 networkTimeout=10000
 retries=0
 retryBackOffMs=500