Add mengqiy to milestone maintainer

Author: mengqiy

config/kubernetes/sig-release/teams.yaml

@@ -84,6 +84,7 @@ teams:
     - marosset # Windows
     - mbianchidev # 1.33 Release Lead Shadow
     - mborsz # Scalability
+    - mengqiy # Scalability
     - michelle192837 # Testing
     - mickeyboxell # 1.32 Release Manager Shadow
     - mikedanese # Auth