Bump protobuf-java from 3.9.1 to 3.16.3 in /parent (#274)

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.9.1 to 3.16.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.9.1...v3.16.3)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
...

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parent/pom.xml

@@ -257,7 +257,7 @@ application while protecting against XSS.
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-java</artifactId>
-        <version>3.9.1</version>
+        <version>3.16.3</version>
         <scope>provided</scope>
       </dependency>
       <dependency>