Type annotations for boto3 IoTSecureTunneling

mypy-boto3-iotsecuretunneling provides type annotations (type stubs) for the `boto3` client for AWS IoTSecureTunneling service. It enhances static analysis for `boto3` usage, allowing tools like MyPy to catch type-related errors before runtime. The current version is 1.42.3, generated by `mypy-boto3-builder` and generally follows the release cadence of new `boto3` features or builder updates.