build(deps): bump java-generator-maven-plugin from 6.5.1 to 6.6.0 (#3313)

Bumps java-generator-maven-plugin from 6.5.1 to 6.6.0.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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>6.5.1</version.fabric8-java-gen>
+        <version.fabric8-java-gen>6.6.0</version.fabric8-java-gen>
         <sundrio.version>0.94.0</sundrio.version>
         <lombok.version>1.18.26</lombok.version>
         <operator.version>1.0.0-v2.0.0.final</operator.version>