Fix trailing comma

Author: saimidu

src/sagemaker/image_uri_config/tensorflow.json

@@ -2727,7 +2727,7 @@
             },
             "2.8.0": {
                 "py_versions": [
-                    "py39",
+                    "py39"
                 ],
                 "registries": {
                     "af-south-1": "626614931356",