Bump protobuf-java from 3.6.1 to 3.16.3

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.6.1 to 3.16.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.6.1...v3.16.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 5536514..688bad2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -136,7 +136,7 @@
         <nimbus-jose-jwt.version>4.41.1</nimbus-jose-jwt.version>
         <opencsv.version>4.6</opencsv.version>
         <plc4x.version>0.8.0</plc4x.version>
-        <protobuf.version>3.6.1</protobuf.version>
+        <protobuf.version>3.16.3</protobuf.version>
         <nats.version>2.11.0</nats.version>
 
     </properties>