Bump org.apache.maven.plugins:maven-gpg-plugin from 3.1.0 to 3.2.8

---
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] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -38,7 +38,7 @@
         <maven.jar.plugin.version>3.4.2</maven.jar.plugin.version>
         <maven.source.plugin.version>3.3.1</maven.source.plugin.version>
         <maven.javadoc.plugin.version>3.10.1</maven.javadoc.plugin.version>
-        <maven.gpg.plugin.version>3.1.0</maven.gpg.plugin.version>
+        <maven.gpg.plugin.version>3.2.8</maven.gpg.plugin.version>
         <maven.surefire.plugin.version>3.5.3</maven.surefire.plugin.version>
         <maven.findbugs.plugin.version>3.0.5</maven.findbugs.plugin.version>
         <maven.checkstyle.plugin.version>3.6.0</maven.checkstyle.plugin.version>