Chore: upgrade some plugin versions

Author: ligangty

pom.xml

@@ -60,15 +60,15 @@
     <projectEmail>http://github.com/Commonjava/commonjava</projectEmail>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <version.plugin.compiler>3.8.1</version.plugin.compiler>
-    <version.plugin.plugin>3.6.0</version.plugin.plugin>
+    <version.plugin.plugin>3.6.2</version.plugin.plugin>
     <version.plugin.plexus-component-metadata>1.6</version.plugin.plexus-component-metadata>
     <version.plugin.release>2.5.3</version.plugin.release>
-    <version.plugin.enforcer>1.4.1</version.plugin.enforcer>
+    <version.plugin.enforcer>3.0.0</version.plugin.enforcer>
     <version.plugin.assembly>3.3.0</version.plugin.assembly>
     <version.plugin.jar>3.2.0</version.plugin.jar>
     <version.plugin.source>3.2.1</version.plugin.source>
-    <version.plugin.javadoc>3.2.0</version.plugin.javadoc>
-    <version.plugin.gpg>1.6</version.plugin.gpg>
+    <version.plugin.javadoc>3.3.1</version.plugin.javadoc>
+    <version.plugin.gpg>3.0.1</version.plugin.gpg>
     <version.plugin.surefire>2.22.2</version.plugin.surefire>
     <version.plugin.failsafe>2.22.2</version.plugin.failsafe>
     <version.plugin.clean>3.1.0</version.plugin.clean>
@@ -77,7 +77,7 @@
     <version.plugin.resources>3.2.0</version.plugin.resources>
     <version.plugin.site>3.9.1</version.plugin.site>
     <version.plugin.pmd>3.9.0</version.plugin.pmd>
-    <version.plugin.jacoco>0.8.6</version.plugin.jacoco>
+    <version.plugin.jacoco>0.8.7</version.plugin.jacoco>
 
     <plugin.jacoco.skip>true</plugin.jacoco.skip>