Invalid security token error when executing nested step function on Step Functions Local
Are nested step functions supported on AWS Step Functions Local? I am trying to create 2 step functions, where the outer one executes the inner one. However, when trying to execute the outer step function, getting an error: "The security token included in the request is invalid".
To reproduce, use the latest `amazon/aws-stepfunctions-local:1.10.1` Docker image. Launch the container with the following command:
```sh
docker run -p 8083:8083 -e AWS_DEFAULT_REGION=us-east-1 -e AWS_ACCESS_KEY_ID=TESTID -e AWS_SECRET_ACCESS_KEY=TESTKEY amazon/aws-stepfunctions-local
```
Then create a simple HelloWorld _inner_ step function in the Step Functions Local container:
```sh
aws stepfunctions --endpoint-url http://localhost:8083 create-state-machine --definition "{\
\"Comment\": \"A Hello World example of the Amazon States Language using a Pass state\",\
\"StartAt\": \"HelloWorld\",\
\"States\": {\
\"HelloWorld\": {\
\"Type\": \"Pass\",\
\"End\": true\
}\
}}" --name "HelloWorld" --role-arn "arn:aws:iam::012345678901:role/DummyRole"
```
Then add a simple _outer_ step function that executes the HelloWorld one:
```sh
aws stepfunctions --endpoint-url http://localhost:8083 create-state-machine --definition "{\
\"Comment\": \"OuterTestComment\",\
\"StartAt\": \"InnerInvoke\",\
\"States\": {\
\"InnerInvoke\": {\
\"Type\": \"Task\",\
\"Resource\": \"arn:aws:states:::states:startExecution\",\
\"Parameters\": {\
\"StateMachineArn\": \"arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorld\"\
},\
\"End\": true\
}\
}}" --name "HelloWorldOuter" --role-arn "arn:aws:iam::012345678901:role/DummyRole"
```
Finally, start execution of the outer Step Function:
```sh
aws stepfunctions --endpoint-url http://localhost:8083 start-execution --state-machine-arn arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorldOuter
```
The execution fails with the _The security token included in the request is invalid_ error in the logs:
```
arn:aws:states:us-east-1:123456789012:execution:HelloWorldOuter:b9627a1f-55ed-41a6-9702-43ffe1cacc2c : {"Type":"TaskSubmitFailed","PreviousEventId":4,"TaskSubmitFailedEventDetails":{"ResourceType":"states","Resource":"startExecution","Error":"StepFunctions.AWSStepFunctionsException","Cause":"The security token included in the request is invalid. (Service: AWSStepFunctions; Status Code: 400; Error Code: UnrecognizedClientException; Request ID: ad8a51c0-b8bf-42a0-a78d-a24fea0b7823; Proxy: null)"}}
```
Am I doing something wrong? Is any additional configuration necessary?
