remove gpg plugin

pom.xml

@@ -119,7 +119,6 @@
         <maven-pmd-plugin.version>3.5</maven-pmd-plugin.version>
         <jdepend-maven-plugin.version>2.0</jdepend-maven-plugin.version>
         <taglist-maven-plugin.version>2.4</taglist-maven-plugin.version>
-        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
         <os-maven-plugin.version>1.5.0.Final</os-maven-plugin.version>
         <docker-maven-plugin.version>0.4.14</docker-maven-plugin.version>
         <apache-rat-plugin.version>0.12</apache-rat-plugin.version>
@@ -773,22 +772,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <!--
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-gpg-plugin</artifactId>
-                <version>${maven-gpg-plugin.version}</version>
-                <executions>
-                    <execution>
-                        <id>sign-artifacts</id>
-                        <phase>verify</phase>
-                        <goals>
-                            <goal>sign</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-             -->
         </plugins>
     </build>