Update mergify.yml

Signed-off-by: David Ko <dko@suse.com>

.github/mergify.yml

@@ -5,9 +5,8 @@ pull_request_rules:
   - check-success=DCO
   - check-success=CodeFactor
   - check-success=codespell
-  - "#approved-reviews-by>=1"
+  - "#approved-reviews-by>=2"
   - approved-reviews-by=@longhorn/maintainer
-  - label=ready-to-merge
   actions:
     merge:
       method: rebase
@@ -17,18 +16,4 @@ pull_request_rules:
   - conflict
   actions:
     comment:
-      message: This pull request is now in conflicts. Could you fix it @{{author}}? 🙏
-
-# Comment on the PR to trigger backport. ex: @Mergifyio copy stable/3.1 stable/4.0
-- name: backport patches to stable branch
-  conditions:
-  - base=master
-  actions:
-    backport:
-      title: "[BACKPORT][{{ destination_branch }}] {{ title }}"
-      body: |
-        This is an automatic backport of pull request #{{number}}.
-        
-        {{cherry_pick_error}}
-      assignees:
-      - "{{ author }}"
+      message: This pull request is now in conflict. Could you fix it @{{author}}? 🙏