ci(mergify): use the shared mergify config

.mergify.yml

@@ -1,29 +1 @@
-pull_request_rules:
-  - name: Auto-update with merge if appropriately labeled
-    conditions:
-      - label=auto-update-merge
-      - -draft
-      - -conflict
-    actions:
-      update:
-  - name: rebase-merge working updates
-    conditions:
-      - or: &authors_are_bots
-          - author=renovate[bot]
-          - author=dependabot[bot]
-      - label=dependencies
-      - -draft
-      - -conflict
-    actions:
-      merge:
-        method: rebase
-  - name: ask to resolve conflict
-    conditions:
-      - conflict
-    actions:
-      comment:
-        message: |
-          Hi @{{author}}! :wave:
-          I could not help but notice that this pull request has conflicts. :confounded:
-          Could you fix it? :wrench:
-          Thank you! :pray:
+extends: mergify-config