fix(ci): drop queue-branch push trigger that cancelled merge_group ci

.github/workflows/ci.yaml

@@ -3,12 +3,6 @@ on:
   pull_request:
     branches: [main]
   merge_group:
-    types: [checks_requested]
-  # merge_group Actions did not start for #41, so `ci / ci` stayed expected
-  # on the queue SHA. The queue branch push reports the same check.
-  push:
-    branches:
-      - "gh-readonly-queue/**"
 
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