Endpoint resolution fails for DynamoDB in "us-gov-east-1" region when useDualstackEndpoint=true

[trivikr]

Describe the bug

Endpoint resolution fails for DynamoDB in "us-gov-east-1" region

Your environment

SDK version number

@aws-sdk/client-dynamodb@3.41.0

Is the issue in the browser/Node.js/ReactNative?

All, tested on Node.js

Details of the browser/Node.js/ReactNative version

$ node -v
v16.13.0

Steps to reproduce

import { DynamoDB } from "@aws-sdk/client-dynamodb"; // v3.41.0

const client = new DynamoDB({
  region: "us-gov-east-1",
  useDualstackEndpoint: true,
});
await client.listTables({});

Observed behavior

/local/home/trivikr/workspace/temp/node_modules/@aws-sdk/config-resolver/dist-cjs/regionInfo/getRegionInfo.js:17
        throw new Error(`Endpoint resolution failed for: ${{ resolvedRegion, useFipsEndpoint, useDualstackEndpoint }}`);
              ^

Error: Endpoint resolution failed for: [object Object]
    at Object.getRegionInfo (/local/home/trivikr/workspace/temp/node_modules/@aws-sdk/config-resolver/dist-cjs/regionInfo/getRegionInfo.js:17:15)
...

Expected behavior

It should send request to dynamodb.us-gov-east-1.api.aws, as it's defined in partition defaults.

aws-sdk-js-v3/codegen/smithy-aws-typescript-codegen/src/main/resources/software/amazon/smithy/aws/typescript/codegen/endpoints.json

Lines 14495 to 14503 in bcfb45b

	{
	"dnsSuffix": "api.aws",
	"hostname": "{service}.{region}.{dnsSuffix}",
	"tags": ["dualstack"]
	}
	]
	},
	"dnsSuffix": "amazonaws.com",
	"partition": "aws-us-gov",

[trivikr]

Equivalent code in AWS CLI v1:

$ aws --version
aws-cli/1.22.9 Python/3.7.10 Linux/5.4.156-94.273.amzn2int.x86_64 botocore/1.23.9

$ AWS_USE_DUALSTACK_ENDPOINT=true aws dynamodb list-tables --region us-gov-east-1 --debug 2>&1 | grep "urllib3.connectionpool" | head -n 1
2021-11-19 01:40:07,585 - MainThread - urllib3.connectionpool - DEBUG - Starting new HTTPS connection (1): dynamodb.us-gov-east-1.api.aws:443

[github-actions]

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