Better config for CodeQL analysis

Signed-off-by: Artem Smotrakov <artem.smotrakov@gmail.com>
diff --git a/.lgtm.yml b/.lgtm.yml
index 13888d1..2eee7a7 100644
--- a/.lgtm.yml
+++ b/.lgtm.yml
@@ -17,5 +17,8 @@
 extraction:
   java:
     index:
-      build_command: "mvn -DskipTests clean package"
+      java_version: 11
+      maven:
+        version: 3.6.3
+      build_command: "mvn -DskipTests -Denforcer.skip clean package"