Sam Gross

ContextVars are not thread-safe in the free-threaded build

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# Bug report The [ContextVar](https://docs.python.org/3/library/contextvars.html) implementation is not thread-safe in the free-threaded build: In particular, the caching is not thread-safe, although there may be other thread-safety issues as well: https://github.com/python/cpython/blob/9c08f40a613d9aee78de4ce4ec3e125d1496d148/Python/context.c#L206-L212...

[3.13] gh-121621: Use PyMutex for writes to asyncio state (GH-121622)

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(cherry picked from commit 5d6861ad06b524358f52603f242e7c0d57532a58) * Issue: gh-121621