Pipelines: CodeStar Connections is now CodeConnections

### Describe the issue

Documentation for `CodePipelineSource.connection` says:
> To use this method, you first need to create a CodeStar connection using the AWS console

The term "CodeStar connection" is confusing, since [AWS CodeStar](https://docs.aws.amazon.com/codestar/latest/userguide/welcome.html) is now deprecated.
> On July 31, 2024, Amazon Web Services (AWS) will discontinue support for creating and viewing AWS CodeStar projects.

However, what is needed is now under AWS CodeConnections ([ref](https://aws.amazon.com/about-aws/whats-new/2024/03/aws-codeconnections-formerly-codestar-connections/))
> Posted On: Mar 29, 2024
> AWS is renaming AWS CodeStar Connections to AWS CodeConnections.

### Links

https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.pipelines.CodePipelineSource.html#static-connectionrepostring-branch-props

Start with the linked CodePipelineSource.connection API documentation and locate the text describing the required connection. Update the wording to refer to AWS CodeConnections rather than a CodeStar connection, then verify the generated documentation no longer uses the confusing deprecated term.

Written by the indexing model from the issue text.