Testing: remove superflous sling.java.version=6 as it's the default now

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1687511 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 8c46d0b..b3dea17 100644
--- a/pom.xml
+++ b/pom.xml
@@ -34,10 +34,6 @@
     <name>Apache Sling Testing JCR Mock</name>
     <description>Mock implementation of selected JCR APIs.</description>
 
-    <properties>
-        <sling.java.version>6</sling.java.version>
-    </properties>
-
     <scm>
         <connection>scm:svn:http://svn.apache.org/repos/asf/sling/trunk/testing/mocks/jcr-mock</connection>
         <developerConnection>scm:svn:https://svn.apache.org/repos/asf/sling/trunk/testing/mocks/jcr-mock</developerConnection>