fix gpg plugin version

Signed-off-by: olivier lamy <[email protected]>

Author: olamy

pom.xml

@@ -387,7 +387,7 @@ limitations under the License.
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-gpg-plugin</artifactId>
-          <version>3.0.0</version>
+          <version>1.6</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>