cpython/Misc/NEWS.d/next/C API/2024-05-21-11-35-11.gh-issue-119247.U6n6mh.rst

Added ``Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST`` and
``Py_END_CRITICAL_SECTION_SEQUENCE_FAST`` macros to make it possible to use
PySequence_Fast APIs safely when free-threaded, and update str.join to work
without the GIL using them.