Bump protobuf-java from 3.19.2 to 3.21.3

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.19.2 to 3.21.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.19.2...v3.21.3)

---
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>

amazon-kinesis-client/pom.xml

@@ -93,7 +93,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.19.2</version>
+      <version>3.21.3</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>