Bump protobuf-java from 3.17.3 to 3.21.12

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.17.3 to 3.21.12.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.17.3...v3.21.12)

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

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

build.gradle

@@ -97,7 +97,7 @@ ext.deps = [
         okhttp3            : 'com.squareup.okhttp3:okhttp:4.9.1',
         leakcanary         : 'com.squareup.leakcanary:leakcanary-android:1.6.3',
         leakcanary2        : 'com.squareup.leakcanary:leakcanary-android:2.6',
-        protobuf           : 'com.google.protobuf:protobuf-java:3.17.3',
+        protobuf           : 'com.google.protobuf:protobuf-java:3.21.12',
         testCore           : 'androidx.test:core:1.4.0',
         testRules          : 'androidx.test:rules:1.4.0',
         // Plugin dependencies