feat: Enable asia-south2

PiperOrigin-RevId: 770342332

Author: vertex-sdk-bot

google/cloud/aiplatform/constants/base.py

@@ -28,6 +28,7 @@
         "asia-northeast2",
         "asia-northeast3",
         "asia-south1",
+        "asia-south2",
         "asia-southeast1",
         "asia-southeast2",
         "australia-southeast1",