mypy-boto3-signin Type Annotations

mypy-boto3-signin provides static type annotations for the `boto3` AWS SDK's SignInService. It is generated by `mypy-boto3-builder` and aims to enhance developer experience by enabling IDE auto-completion, catching type-related errors at development time, and improving code readability for `boto3` client interactions with the SignInService. Releases are frequent, typically aligning with new `boto3` versions or `mypy-boto3-builder` updates.