GH-533 - Upgrade to Maven GPG Plugin 3.2.1.

Author: odrotbohm

pom.xml

@@ -207,7 +207,7 @@ limitations under the License.
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
-						<version>3.1.0</version>
+						<version>3.2.1</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>