build(deps): bump java-generator-maven-plugin from 6.3.0 to 6.3.1

Bumps java-generator-maven-plugin from 6.3.0 to 6.3.1.

---
updated-dependencies:
- dependency-name: io.fabric8:java-generator-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

system-tests/pom.xml

@@ -18,7 +18,7 @@
         <version.junit.jupiter>5.8.2</version.junit.jupiter>
         <version.junit.platform>1.7.0</version.junit.platform>
         <version.fabric8>5.12.2</version.fabric8>
-        <version.fabric8-java-gen>6.3.0</version.fabric8-java-gen>
+        <version.fabric8-java-gen>6.3.1</version.fabric8-java-gen>
         <sundrio.version>0.93.1</sundrio.version>
         <lombok.version>1.18.24</lombok.version>
         <operator.version>1.0.0-v2.0.0.final</operator.version>