Bump protobuf-java from 3.18.2 to 3.19.6 in /parsec-protobuf-java (#23)

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.18.2 to 3.19.6.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.18.2...v3.19.6)

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

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Author: dependabot[bot]

parsec-protobuf-java/pom.xml

@@ -12,7 +12,7 @@
 
     <properties>
         <protoc.version>3.18.0</protoc.version>
-        <protobuf.version>3.18.2</protobuf.version>
+        <protobuf.version>3.19.6</protobuf.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>