(2.2.x): Bump cfJavaClientVersion from 5.10.0.RELEASE to 5.12.0.RELEASE

Bumps `cfJavaClientVersion` from 5.10.0.RELEASE to 5.12.0.RELEASE.

Updates `org.cloudfoundry:cloudfoundry-client-reactor` from 5.10.0.RELEASE to 5.12.0.RELEASE
- [Release notes](https://github.com/cloudfoundry/cf-java-client/releases)
- [Commits](cloudfoundry/cf-java-client@v5.10.0.RELEASE...v5.12.0.RELEASE)

Updates `org.cloudfoundry:cloudfoundry-operations` from 5.10.0.RELEASE to 5.12.0.RELEASE
- [Release notes](https://github.com/cloudfoundry/cf-java-client/releases)
- [Commits](cloudfoundry/cf-java-client@v5.10.0.RELEASE...v5.12.0.RELEASE)

---
updated-dependencies:
- dependency-name: org.cloudfoundry:cloudfoundry-client-reactor
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.cloudfoundry:cloudfoundry-operations
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -19,7 +19,7 @@ import java.util.concurrent.ConcurrentHashMap
 buildscript {
 	ext {
 		blockHoundVersion = "1.0.8.RELEASE"
-		cfJavaClientVersion = "5.10.0.RELEASE"
+		cfJavaClientVersion = "5.12.0.RELEASE"
 		commonsTextVersion = "1.11.0"
 		immutablesVersion = "2.10.1"
 		openServiceBrokerVersion = "4.1.0"