Log Message:
py-gevent: updated to 21.12.0

21.12.0 (2021-12-11)
====================

Features
--------

- Update autoconf files for Apple Silicon Macs. Note that while there
  are reports of compiling gevent on Apple Silicon Macs now, this is
  *not* a tested configuration. There may be some remaining issues with
  CFFI on some systems as well.
  See :issue:`1721`.
- Build and upload CPython 3.10 binary manylinux wheels.

  Unfortunately, this required us to stop building and uploading CPython
  2.7 binary manylinux wheels. Binary wheels for 2.7 continue to be
  available for Windows and macOS.
  See :issue:`1822`.
- Test and distribute musllinux_1_1 wheels.
  See :issue:`1837`.
- Update the tested versions of PyPy2 and PyPy3. For PyPy2, there should
  be no user visible changes, but for PyPy3, support has moved from
  Python 3.6 to Python 3.7.
  See :issue:`1843`.

Bugfixes
--------

- Try to avoid linking to two different Python runtime DLLs on Windows.
  See :issue:`1814`.
- Stop compiling manylinux wheels with ``-ffast-math.`` This was
  implicit in ``-Ofast``, but could alter the global state of the
  process. Analysis and fix thanks to Ilya Konstantinov.
  See :issue:`1820`.
- Fix hanging the interpreter on shutdown if gevent monkey patching
  occurred on a non-main thread in Python 3.9.8 and above. (Note that
  this is not a recommended practice.)
  See :issue:`1839`.