Use PyContextVar_Get() backport before PyPy 7.3.6 (GH-4454)
Use PyContextVar_Get() backport before PyPy 7.3.6 (GH-4454)

PyContextVar_Get() was added in PyPy 7.3.6.
https://foss.heptapod.net/pypy/pypy/-/blob/branch/default/pypy/doc/release-v7.3.6.rst
cython/cython,scoder/cython,da-woods/cython,cython/cython,scoder/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython,scoder/cython,da-woods/cython