SLING-10830 - Run Sling ITs with Java 17 as well

Debug information
diff --git a/vars/slingOsgiBundleBuild.groovy b/vars/slingOsgiBundleBuild.groovy
index 276bb13..3034161 100644
--- a/vars/slingOsgiBundleBuild.groovy
+++ b/vars/slingOsgiBundleBuild.groovy
@@ -77,8 +77,11 @@
 
 def jenkinsJdkLabel(int jdkVersion, def globalConfig) {
     def label = globalConfig.availableJDKs[jdkVersion]
-    if ( !label )
+    if ( !label ) {
+        // debug
+        echo "No label for JDK version ${jdkVersion} in ${globalConfig.availableJDKs}"
         throw new RuntimeException("Unknown JDK version ${jdkVersion}")    
+    }
     return label
 }