[skip ci] update mergify (#1983)

Signed-off-by: Njinhai <hai.jin@zilliz.com>

.mergify/config.yml

@@ -6,6 +6,8 @@ pull_request_rules:
         - "#review-requested=0"
         - "#changes-requested-reviews-by=0"
         - "#commented-reviews-by=0"
+        - "status-success=DCO"
+        - "status-success=continuous-integration/jenkins/pr-merge"
       actions:
         merge:
           method: squash