Bump org.apache.maven.plugins:maven-jar-plugin in /xmvn-parent

Bumps [org.apache.maven.plugins:maven-jar-plugin](https://github.com/apache/maven-jar-plugin) from 3.3.0 to 3.4.2.
- [Release notes](https://github.com/apache/maven-jar-plugin/releases)
- [Commits](apache/maven-jar-plugin@maven-jar-plugin-3.3.0...maven-jar-plugin-3.4.2)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-jar-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

xmvn-parent/pom.xml

@@ -100,7 +100,7 @@
     <injectionApiVersion>1</injectionApiVersion>
     <installPluginVersion>3.1.3</installPluginVersion>
     <jacocoVersion>0.8.12</jacocoVersion>
-    <jarPluginVersion>3.3.0</jarPluginVersion>
+    <jarPluginVersion>3.4.2</jarPluginVersion>
     <javadocPluginVersion>3.10.0</javadocPluginVersion>
     <junitVersion>5.11.1</junitVersion>
     <jxrPluginVersion>2.3</jxrPluginVersion>