Add DeepAR ap-northeast-3 repository. (#3120)

Author: jaheba

tests/unit/sagemaker/image_uris/test_algos.py

@@ -104,6 +104,7 @@
             "ap-east-1": "286214385809",
             "ap-northeast-1": "633353088612",
             "ap-northeast-2": "204372634319",
+            "ap-northeast-3": "867004704886",
             "ap-south-1": "991648021394",
             "ap-southeast-1": "475088953585",
             "ap-southeast-2": "514117268639",