Remove unnecessary default group ID (#681)

Author: basil

pom.xml

@@ -1267,7 +1267,6 @@
       <build>
         <plugins>
           <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-clean-plugin</artifactId>
             <configuration>
               <filesets>
@@ -1440,7 +1439,6 @@
       <build>
         <plugins>
           <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-surefire-plugin</artifactId>
             <configuration>
               <includes>