Bump protobuf-java from 3.11.4 to 3.12.0 (#116)

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.11.4 to 3.12.0.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.11.4...v3.12.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

protobuff-support/build.gradle

@@ -13,7 +13,7 @@ dependencies {
     compile "io.micronaut:micronaut-http:$micronautVersion"
     compile "io.micronaut:micronaut-http-netty:$micronautVersion"
     //protobuf
-    compile "com.google.protobuf:protobuf-java:3.11.4"
+    compile "com.google.protobuf:protobuf-java:3.12.0"
     compile "com.google.protobuf:protobuf-java-util:3.11.4"
     compile 'javax.annotation:javax.annotation-api:1.3.2'