Updated endpoints.json.

Author: AWS

.changes/next-release/feature-AWSSDKforJavav2-e97801d.json

@@ -0,0 +1,5 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "description": "Updated service endpoint metadata."
+}

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

@@ -2289,6 +2289,11 @@
           "us-east-1" : { }
         }
       },
+      "managedblockchain" : {
+        "endpoints" : {
+          "us-east-1" : { }
+        }
+      },
       "marketplacecommerceanalytics" : {
         "endpoints" : {
           "us-east-1" : { }