Update .asf.yaml for release branch PRs (#1356)

Author: paulirwin

.asf.yaml

@@ -73,9 +73,3 @@ github:
       restrict_deletion: true
       restrict_force_push: false
       required_linear_history: false
-      required_conversation_resolution: true
-      required_pull_request_reviews:
-        dismiss_stale_reviews: false
-        require_last_push_approval: false
-        require_code_owner_reviews: false
-        required_approving_review_count: 0