[maven] Bump org.apache.maven.plugins:maven-gpg-plugin

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.2.5 to 3.2.6.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.2.5...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-patch
...

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

pom.xml

@@ -135,7 +135,7 @@
     <maven-license-plugin.version>4.5</maven-license-plugin.version>
     <maven-ayoy-license-verifier.version>1.2.0</maven-ayoy-license-verifier.version>
     <maven-sonar-plugin.version>4.0.0.4121</maven-sonar-plugin.version>
-    <maven-gpg-plugin.version>3.2.5</maven-gpg-plugin.version>
+    <maven-gpg-plugin.version>3.2.6</maven-gpg-plugin.version>
     <maven-staging-plugin.version>1.7.0</maven-staging-plugin.version>
   </properties>