Revert "Change the number of approving_review_count to 2 (#6456)" (#6706)

This reverts commit 4d69685b

.asf.yaml

@@ -44,4 +44,4 @@ github:
         strict: true
       required_pull_request_reviews:
         dismiss_stale_reviews: true
-        required_approving_review_count: 2
+        required_approving_review_count: 1