use maven-gpg-plugin 3.2.7 instead simplify4u

pom.xml

@@ -156,7 +156,7 @@
           </archive>
         </configuration>
       </plugin>
-<!-- see https://maven.apache.org/plugins/maven-gpg-plugin/usage.html
+<!-- see https://maven.apache.org/plugins/maven-gpg-plugin/usage.html -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-gpg-plugin</artifactId>
@@ -170,10 +170,8 @@
           </execution>
         </executions>
       </plugin>
-  -->
 <!-- or use simplify4u : https://www.simplify4u.org/sign-maven-plugin/
 Key configuration can be provided by environment variables: SIGN_KEY, SIGN_KEY_ID, SIGN_KEY_PASS
- -->
       <plugin>
         <groupId>org.simplify4u.plugins</groupId>
         <artifactId>sign-maven-plugin</artifactId>
@@ -184,13 +182,13 @@ Key configuration can be provided by environment variables: SIGN_KEY, SIGN_KEY_I
                     <goal>sign</goal>
                 </goals>
 				<configuration>
-					<!-- the same id as in settings.xml -->
+					<!- - the same id as in settings.xml - ->
 					<serverId>sign-key-id</serverId>
 				</configuration>
             </execution>
         </executions>
       </plugin>
-      
+ -->
     </plugins>
   </build>