Describe the bug

Hello there,

Im receiving an error when I try to deploy a CDK template using python. The message says "XXX is not authorized to perform AssumeRole on role XXXXX (Service: AWSCodePipeline Error Code: InvalidStructureException) (module name): (short issue description)"

Im not using a constructor for the core CodePipeline but im using the examples from the documentation:

`
from aws_cdk.pipelines import CodePipeline, ShellStep, CodePipelineSource, ManualApprovalStep

Creating a pipeline with a manual approval step.

    pipeline =  CodePipeline(self, "Pipeline-IVR-" + stage, 
                    pipeline_name="Pipeline-IVR-" + stage,
                    synth=ShellStep("Synth", 
                        input=CodePipelineSource.s3(s3Bucket, "infraIVR.zip"),
                        commands=["npm install -g aws-cdk", 
                            "python -m pip install -r requirements.txt", 
                            "cdk synth"]
                    )
                )`

If I try to deploy the same package on another account all is OK

Expected Behavior

I expect to be able to deploy the base pipeline

Current Behavior

Im receiving an error when I try to deploy a CDK template using python. The message says "XXX is not authorized to perform AssumeRole on role XXXXX (Service: AWSCodePipeline Error Code: InvalidStructureException) (module name): (short issue description)"

Reproduction Steps

`
from aws_cdk.pipelines import CodePipeline, ShellStep, CodePipelineSource, ManualApprovalStep

Creating a pipeline with a manual approval step.

    pipeline =  CodePipeline(self, "Pipeline-IVR-" + stage, 
                    pipeline_name="Pipeline-IVR-" + stage,
                    synth=ShellStep("Synth", 
                        input=CodePipelineSource.s3(s3Bucket, "infraIVR.zip"),
                        commands=["npm install -g aws-cdk", 
                            "python -m pip install -r requirements.txt", 
                            "cdk synth"]
                    )
                )`

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.18.0

Framework Version

No response

Node.js Version

12.22.8

OS

Windows

Language

Python

Language Version

No response

Other information

No response