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

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.0.1 to 3.2.6.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.0.1...maven-gpg-plugin-3.2.6)

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

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

xmvn-parent/pom.xml

@@ -96,7 +96,7 @@
     <dependencyPluginVersion>3.8.0</dependencyPluginVersion>
     <deployPluginVersion>3.1.1</deployPluginVersion>
     <easymockVersion>5.4.0</easymockVersion>
-    <gpgPluginVersion>3.0.1</gpgPluginVersion>
+    <gpgPluginVersion>3.2.6</gpgPluginVersion>
     <injectionApiVersion>1</injectionApiVersion>
     <installPluginVersion>3.1.3</installPluginVersion>
     <jacocoVersion>0.8.10</jacocoVersion>