change: Update TF version to 2.8.4 (aws#3579)

Author: kenny-ezirim

src/sagemaker/image_uri_config/tensorflow.json

@@ -305,7 +305,7 @@
             "2.5": "2.5.1",
             "2.6": "2.6.3",
             "2.7": "2.7.0",
-            "2.8": "2.8.0",
+            "2.8": "2.8.4",
             "2.9": "2.9.3",
             "2.10": "2.10.1",
             "2.11": "2.11.0"
@@ -1637,6 +1637,42 @@
                 },
                 "repository": "tensorflow-inference"
             },
+            "2.8.4": {
+                "registries": {
+                    "af-south-1": "626614931356",
+                    "ap-east-1": "871362719292",
+                    "ap-northeast-1": "763104351884",
+                    "ap-northeast-2": "763104351884",
+                    "ap-northeast-3": "364406365360",
+                    "ap-south-1": "763104351884",
+                    "ap-south-2": "772153158452",
+                    "ap-southeast-1": "763104351884",
+                    "ap-southeast-2": "763104351884",
+                    "ap-southeast-3": "907027046896",
+                    "ca-central-1": "763104351884",
+                    "cn-north-1": "727897471807",
+                    "cn-northwest-1": "727897471807",
+                    "eu-central-1": "763104351884",
+                    "eu-central-2": "380420809688",
+                    "eu-north-1": "763104351884",
+                    "eu-south-1": "692866216735",
+                    "eu-south-2": "503227376785",
+                    "eu-west-1": "763104351884",
+                    "eu-west-2": "763104351884",
+                    "eu-west-3": "763104351884",
+                    "me-south-1": "217643126080",
+                    "me-central-1": "914824155844",
+                    "sa-east-1": "763104351884",
+                    "us-east-1": "763104351884",
+                    "us-east-2": "763104351884",
+                    "us-gov-east-1": "446045086412",
+                    "us-gov-west-1": "442386744353",
+                    "us-iso-east-1": "886529160074",
+                    "us-west-1": "763104351884",
+                    "us-west-2": "763104351884"
+                },
+                "repository": "tensorflow-inference"
+            },
             "2.9.2": {
                 "registries": {
                     "af-south-1": "626614931356",