Bump gevent from 21.8.0 to 21.12.0

Created by: dependabot[bot]

Bumps gevent from 21.8.0 to 21.12.0.

Commits

• a904564 Preparing release 21.12.0
• 8455c2f Rename .misc fragments to something more appropriate.
• 3c25d9e Rename .misc fragments to something more appropriate.
• f1eebef Update comment about lsof being broken on BusyBox/musl.
• cedd840 Merge pull request #1846 from gevent/issue1837
• 303fd81 Adding musllinux binary wheels and testing.
• 2784400 Merge pull request #1845 from gevent/issue1843
• f1c55ee Move to PyPy 3.7
• 51c5aa8 Update Win PyPy2.7 from 7.3.1 to 7.3.6
• 3ca670e Merge pull request #1844 from gevent/py310final
• Additional commits viewable in compare view

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