SLING-7253 Upgrade Karaf to 4.2

use Karaf 4.2.0
diff --git a/pom.xml b/pom.xml
index d5d0b57..9fcce35 100644
--- a/pom.xml
+++ b/pom.xml
@@ -63,7 +63,7 @@
       <groupId>org.apache.karaf</groupId>
       <artifactId>apache-karaf</artifactId>
       <type>tar.gz</type>
-      <version>4.2.0.M2</version>
+      <version>4.2.0</version>
       <scope>test</scope>
       <exclusions>
         <exclusion>