Context Variables

The `contextvars` library is a backport of the standard library `contextvars` module (introduced in Python 3.7 via PEP 567), providing APIs to manage, store, and access context-local state. It enables task-local variables in asynchronous code, ensuring data isolation across different coroutines or threads without explicit argument passing. The current version is 2.4, and it typically releases on demand for bug fixes or dependency updates.