no need of this path and use last invoker-plugin version

Signed-off-by: olivier lamy <olamy@apache.org>
diff --git a/maven-enforcer-plugin/pom.xml b/maven-enforcer-plugin/pom.xml
index f2f6c34..f996c5d 100644
--- a/maven-enforcer-plugin/pom.xml
+++ b/maven-enforcer-plugin/pom.xml
@@ -157,7 +157,9 @@
       <build>
         <plugins>
           <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-invoker-plugin</artifactId>
+            <version>3.2.1</version>
             <configuration>
               <debug>true</debug>
               <projectsDirectory>src/it/projects</projectsDirectory>
diff --git a/pom.xml b/pom.xml
index ca8ad33..f49e715 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,6 @@
     <artifactId>maven-parent</artifactId>
     <groupId>org.apache.maven</groupId>
     <version>34</version>
-    <relativePath>../pom/maven/pom.xml</relativePath>
   </parent>
   <groupId>org.apache.maven.enforcer</groupId>
   <artifactId>enforcer</artifactId>