SLING-3017 Improve Karaf integration tests

use latest releases
diff --git a/pom.xml b/pom.xml
index 3186a39..9b7199f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -90,7 +90,7 @@
     <dependency>
       <groupId>org.apache.sling</groupId>
       <artifactId>org.apache.sling.engine</artifactId>
-      <version>2.6.14</version>
+      <version>2.6.16</version>
       <scope>test</scope>
     </dependency>
     <dependency>