build(deps): bump protobuf-java to 3.21.8

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.21.7 to 3.21.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.21.7...v3.21.8)

---
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]>

Author: dependabot[bot]

pom.xml

@@ -45,7 +45,7 @@
     <snakeyaml.version>1.30</snakeyaml.version>
     <slf4j.version>1.7.36</slf4j.version>
     <caffeine.version>2.9.3</caffeine.version>
-    <protobuf.version>3.19.4</protobuf.version>
+    <protobuf.version>3.21.8</protobuf.version>
     <junit.version>4.13</junit.version>
     <bucket4j.version>7.3.0</bucket4j.version>
     <bouncycastle.version>1.70</bouncycastle.version>