Maven: Bump org.apache.maven.plugins:maven-gpg-plugin

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-version: 3.2.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -57,7 +57,7 @@
         <maven-javadoc-plugin.version>2.10.4</maven-javadoc-plugin.version>
         <maven-source-plugin.version>2.3</maven-source-plugin.version>
         <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>        
-        <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
+        <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
 
 
         <maven-resources-plugin.version>3.0.1</maven-resources-plugin.version>