add new account to deepAR

Author: haixiw

src/sagemaker/image_uri_config/forecasting-deepar.json

@@ -11,6 +11,7 @@
                 "ap-south-1": "991648021394",
                 "ap-southeast-1": "475088953585",
                 "ap-southeast-2": "514117268639",
+                "ap-southeast-3": "951798379941",
                 "ca-central-1": "469771592824",
                 "cn-north-1": "390948362332",
                 "cn-northwest-1": "387376663083",