updated Mergify configuration (#3632)

Co-authored-by: Stefano Ricci <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.mergify.yml

@@ -1,16 +1,16 @@
 queue_rules:
   - name: default
-    conditions:
+    queue_conditions:
       - check-success=build
       - check-success=DeepScan
-
+    merge_method: squash
+
 pull_request_rules:
   - name: Automatic merge on approval
     conditions:
       - "#approved-reviews-by>=1"
     actions:
       queue:
-        method: squash
         name: default
   - name: automatic branch update
     conditions: