[Backport 2.x] Bump protobuf-java to 3.21.8 (#5005)

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]>
Signed-off-by: Vacha Shah <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>

Author: VachaShah

CHANGELOG.md

@@ -105,6 +105,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Update Jackson Databind to 2.13.4.2 (addressing CVE-2022-42003) ([#4781](https://github.com/opensearch-project/OpenSearch/pull/4781))
 - Install and configure Log4j JUL Adapter for Lucene 9.4 ([#4754](https://github.com/opensearch-project/OpenSearch/pull/4754))
 - Added feature to ignore indexes starting with dot during shard limit validation.([#4695](https://github.com/opensearch-project/OpenSearch/pull/4695))
+- Bump protobuf-java to 3.21.8 ([#5005](https://github.com/opensearch-project/OpenSearch/pull/5005))
 ### Changed
 - Refactored BalancedAllocator.Balancer to LocalShardsBalancer ([#4818](https://github.com/opensearch-project/OpenSearch/pull/4818))
 ### Deprecated
@@ -131,4 +132,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Security
 
 [Unreleased]: https://github.com/opensearch-project/OpenSearch/compare/2.2.0...HEAD
-[2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.2.0...2.x
+[2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.2.0...2.x

test/fixtures/hdfs-fixture/build.gradle

@@ -49,7 +49,7 @@ dependencies {
   api "com.fasterxml.woodstox:woodstox-core:${versions.woodstox}"
   api 'net.minidev:json-smart:2.4.8'
   api "org.mockito:mockito-core:${versions.mockito}"
-  api "com.google.protobuf:protobuf-java:3.21.2"
+  api "com.google.protobuf:protobuf-java:3.21.8"
   api "org.jetbrains.kotlin:kotlin-stdlib:${versions.kotlin}"
   api 'org.eclipse.jetty:jetty-server:9.4.49.v20220914'
 }