The API Gateway RequestAuthorizer URI is not partition based

[DRNagar]

• The requestURI for the the API GW authorizers does not take partition into account

  aws-cdk/packages/@aws-cdk/aws-apigateway/lib/authorizers/lambda.ts

  Line 235 in 986e281

  authorizerUri: `arn:aws:apigateway:${Stack.of(this).region}:lambda:path/2015-03-31/functions/${props.handler.functionArn}/invocations`,

• It is always in the classic partition

Reproduction Steps

• running cdk in a different partition such as china

 "AuthorizerUri": {
          "Fn::Join": [
            "",
            [
              "arn:aws:apigateway:cn-north-1:lambda:path/2015-03-31/functions/",
              {
                "Ref": "xyz"
              },
              "/invocations"
            ]
          ]

Error Log

• Attempting to deploy this will cause the following error for API GW
  Authorizer URI should be a valid API Gateway ARN that represents a Lambda function invocation.

Environment

• CLI Version :
• **Framework Version:**1.22.0
• **OS :**Mac
• **Language :**Tyepscript

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This is 🐛 Bug Report