ci(mergify): upgrade configuration to current format

mergify[bot] · mergify[bot] · commit f02042e09ecc · 2025-05-11T20:39:05.000Z
diff --git a/.github/mergify.yml b/.github/mergify.yml
@@ -19,7 +19,7 @@ priority_rules:
   - name: priority for queue `default`
     conditions:
       - queue-name=default
-    priority: 2500
+    priority: 2750
 
   - name: priority for queue `squash-merge`
     conditions:
