Update .mergify.yml

Author: kunal-kushwaha

.mergify.yml

@@ -1,7 +1,8 @@
 pull_request_rules:
-  - name: Automatic merge on approval
+  - name: assign PRs with Python files modified to jd
     conditions:
-      - "#approved-reviews-by>=1"
+      - files~=\.java$
     actions:
-      merge:
-        method: merge
+      assign:
+        add_users:
+          - kunal-kushwaha