Updated endpoints.json and partitions.json.

Author: AWS

.changes/next-release/feature-AWSSDKforJavav2-0443982.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "Updated endpoint and partition metadata."
+}

core/regions/src/main/resources/software/amazon/awssdk/regions/internal/region/endpoints.json

@@ -19214,6 +19214,7 @@
           "eu-north-1" : { },
           "eu-west-1" : { },
           "eu-west-2" : { },
+          "sa-east-1" : { },
           "us-east-1" : { },
           "us-east-2" : { },
           "us-west-2" : { }