Bump org.apache.maven.plugins:maven-gpg-plugin from 3.2.3 to 3.2.4

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.2.3 to 3.2.4.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.2.3...maven-gpg-plugin-3.2.4)

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

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

pom.xml

@@ -44,7 +44,7 @@
         <jmockit.version>1.49</jmockit.version>
 
         <maven-source-plugin.version>3.3.1</maven-source-plugin.version>
-        <maven-gpg-plugin.version>3.2.3</maven-gpg-plugin.version>
+        <maven-gpg-plugin.version>3.2.4</maven-gpg-plugin.version>
     </properties>
 
     <developers>