Bump eventlet from 0.24.1 to 0.31.0 in /backend

[dependabot[bot]]

Bumps eventlet from 0.24.1 to 0.31.0.

Changelog

Sourced from eventlet's changelog.

0.31.0

• IMPORTANT: websocket: Limit maximum uncompressed frame length to 8MiB https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2

0.30.3

• wsgi: websocket ALREADY_HANDLED flag on corolocal
• green.ssl: Set suppress_ragged_eofs default based on SSLSocket defaults
• greenio: socket.connect_ex returned None instead of 0 on success
• Use _imp instead of deprecated imp

0.30.2

• greendns: patch ssl to fix RecursionError on SSLContext.options.set eventlet/eventlet#677

0.30.1

• patcher: built-in open() did not accept kwargs eventlet/eventlet#683

0.30.0

• pyopenssl tsafe module was deprecated and removed in v20.0.0
• deprecate pyevent hub
• Deprecate CPython 2.7 and 3.4 support
• py39: Add _at_fork_reinit method to Semaphores

0.29.1

patcher: [py27] recursion error in pytest/python2.7 installing register_at_fork eventlet/eventlet#660 patcher: monkey_patch(builtins=True) failed on py3 because file class is gone eventlet/eventlet#541 don't crash on PyPy 7.0.0 eventlet/eventlet#547 Only install monotonic on python2 eventlet/eventlet#583

0.29.0

• ssl: context wrapped listener fails accept() eventlet/eventlet#651

0.28.1

• Sorry, Eventlet was broken on Windows for versions 0.27-0.28 patcher: no os.register_at_fork on Windows (#654)
• Clean up TypeError in del

0.28.0

• Always remove the right listener from the hub eventlet/eventlet#645

0.27.0

• patcher: Clean up threading book-keeping at fork when monkey-patched

... (truncated)

Commits

• f717f38 v0.31.0 release
• 1412f5e websocket: Limit maximum uncompressed frame length to 8MiB
• b0be94e v0.30.3 release
• df0bc00 wsgi: websocket ALREADY_HANDLED flag on corolocal
• 377b4fb green.ssl: Set suppress_ragged_eofs default based on SSLSocket defaults
• 71b76bf Security Policy
• 50441fc greenio: socket.connect_ex returned None instead of 0 on success
• e16fcab Use _imp instead of deprecated imp
• 83b14ed v0.30.2 release
• 79cf4ea greendns: Patch ssl
• Additional commits viewable in compare view

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