gh-155519: fix data-race for Context.ctx_vars - #155522
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The HAMT held by a context is immutable, but the pointer to it is not: contextvar_set() and contextvar_del() install a new HAMT and drop the reference to the previous one. Use critical sections to ensure ordering in the free-threaded build.
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The HAMT held by a context is immutable, but the pointer to it is not:
contextvar_set()andcontextvar_del()install a new HAMT and drop the reference to the previous one. Use critical sections to ensure ordering in the free-threaded build.