Bump protobuf-java in /statefun-shaded/statefun-protobuf-shaded

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.7.1 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@v3.7.1...v3.16.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

statefun-shaded/statefun-protobuf-shaded/pom.xml

@@ -32,7 +32,7 @@ under the License.
 
     <properties>
         <protobuf-sources.dir>${generated-sources.basedir}/shaded-protobuf-java/</protobuf-sources.dir>
-        <protobuf.version>3.7.1</protobuf.version>
+        <protobuf.version>3.16.3</protobuf.version>
     </properties>
 
     <dependencies>