ci(mergify): upgrade configuration to current format

Author: mergify[bot]

.github/mergify.yml

@@ -1,17 +1,15 @@
+
 pull_request_rules:
   - name: Dependabot
-    conditions:
-      - author=dependabot[bot]
-      - check-success=all-tests-succeeded
+    conditions: []
     actions:
       queue:
-        method: merge
-        name: dependabot
-
 queue_rules:
   - name: dependabot
     batch_size: 10
     batch_max_wait_time: 30 min
     queue_conditions:
       - author=dependabot[bot]
-      - check-success=all-tests-succeeded
+      - check-success=all-tests-succeeded
+    merge_conditions: []
+    merge_method: merge