infra: Increase PR reviewers to 3 when merge to master. (#11280)

We need more eyes to improve code quality
diff --git a/.asf.yaml b/.asf.yaml
index 2fbe377..ef0571a 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -52,7 +52,7 @@
         required_pull_request_reviews:
           dismiss_stale_reviews: true
           require_code_owner_reviews: true
-          required_approving_review_count: 2
+          required_approving_review_count: 3
       release/3.9:
         required_pull_request_reviews:
           require_code_owner_reviews: true