Type annotations for boto3 STS

mypy-boto3-sts provides PEP 561-compliant type annotations for the `boto3` STS (AWS Security Token Service) client, compatible with mypy, pyright, VSCode, PyCharm, and other type-checking tools. It ensures type safety and offers enhanced code completion for `boto3.client("sts")` operations. The current version, 1.42.3, aligns with boto3 1.42.3 and is generated by mypy-boto3-builder 8.12.0. The library follows the release cadence of `boto3` and its builder.