Bump com.google.protobuf:protobuf-java from 3.21.5 to 3.21.12

Bumps [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.21.5 to 3.21.12.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.21.5...v3.21.12)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ logback = "1.4.14"
 micrometer = "1.12.7"
 micrometer-docs-gen = "1.0.2"
 micrometer-tracing = "1.2.7"
-protobuf = "3.21.5"
+protobuf = "3.21.12"
 pulsar = "3.1.3"
 pulsar-reactive = "0.5.5"
 reactor = "2023.0.6"