HDDS-14692. Bump maven-gpg-plugin to 3.2.8 (#9799)

Author: dependabot[bot]

pom.xml

@@ -145,7 +145,7 @@
     <maven-dependency-plugin.version>3.10.0</maven-dependency-plugin.version>
     <maven-deploy-plugin.version>3.1.4</maven-deploy-plugin.version>
     <maven-enforcer-plugin.version>3.6.2</maven-enforcer-plugin.version>
-    <maven-gpg-plugin.version>3.2.7</maven-gpg-plugin.version>
+    <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
     <maven-install-plugin.version>3.1.3</maven-install-plugin.version>
     <maven-jar-plugin.version>3.5.0</maven-jar-plugin.version>
     <maven-javadoc-plugin.version>3.11.2</maven-javadoc-plugin.version>