Slightly betteer message when .*JCK-runtime.* is not found in Javates…

…tUtil.java (adoptium#5496)

jck/jtrunner/JavatestUtil.java

@@ -253,7 +253,7 @@ public static void main(String args[]) throws Exception {
 		}
 
 		if (!found) {
-			System.out.println("Cannot locate the JCK artifacts under : " + jckRoot);
+			System.out.println("Cannot locate the `.*JCK-runtime.*` artifacts under : " + jckRoot);
 			System.exit(1);
 		}