Add missing groupId of parent

Issue-Ref: 3620
Signed-off-by: Alexander Diewald <diewald@fortiss.org>

org.fortiss.af3.phoenix.product/pom.xml

@@ -8,6 +8,7 @@
   <packaging>eclipse-repository</packaging>
 
   <parent>
+    <groupId>org.fortiss.af3</groupId>
     <artifactId>org.fortiss.af3.root</artifactId>
     <version>1.0.0-SNAPSHOT</version>
     <relativePath>../../../pom.xml</relativePath>