ci(mergify): upgrade configuration to current format

mergify[bot] · mergify[bot] · commit 9374adb80e3e · 2025-04-23T06:42:10.000Z
diff --git a/.mergify.yml b/.mergify.yml
@@ -39,4 +39,4 @@ priority_rules:
   - name: priority for queue `duplicated default from merge on approval`
     conditions:
       - "#approved-reviews-by>=1"
-    priority: 2500
+    priority: 2750
