ci(mergify): upgrade configuration to current format

.github/mergify.yml

@@ -1,16 +1,17 @@
 queue_rules:
   - name: dependabot-updates
-    conditions:
+    queue_conditions:
+      - 'author=dependabot[bot]'
+    merge_conditions:
       - check-success=Run Tests
       - check-success=Check Javadocs
       - check-success=Analyze
       - check-success=CodeQL
       - check-success=CodeFactor
+    merge_method: merge
 
 pull_request_rules:
-  - name: Automatic merge for Dependabot pull requests
-    conditions: [ 'author=dependabot[bot]' ]
+  - name: refactored queue action rule
+    conditions: []
     actions:
       queue:
-        method: merge
-        name: dependabot-updates