build(deps): bump gunicorn from 20.0.0 to 20.0.4

[dependabot-preview]

Bumps gunicorn from 20.0.0 to 20.0.4.

Release notes

Sourced from gunicorn's releases.

20.0.4

• fix binding a socket using the file descriptor
• remove support for the bdist_rpm build

20.0.3

• fixed load of a config file without a Python extension
• fixed socketfromfd.fromfd when defaults are not set

note: we now warn when we load a config file without Python Extension

20.0.2

• fix changelog

20.0.1

• fixed the way the config module is loaded. __file__ is now available
• fixed wsgi.input_terminated. It is always true.
• use the highest protocol version of openssl by default
• only support Python >= 3.5
• added __repr__ method to Config instance
• fixed support of AIX platform and musl libc in socketfromfd.fromfd function
• fixed support of applications loaded from a factory function
• fixed chunked encoding support to prevent any request smuggling <https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn>_
• Capture os.sendfile before patching in gevent and eventlet workers.
  fix RecursionError.
• removed locking in reloader when adding new files
• load the WSGI application before the loader to pick up all files

note this release add official support for applications loaded from a factory function
as documented in Flask and other places.

Commits

• 5d0c778 bump to 20.0.4
• 67cb620 remove socketfromfd module
• c583377 Revert "socketfromfd: remove python 2 compatibility"
• ab25bae Revert "socketfromfd: fix cross platform usage"
• 8c759dd Revert "fix linting on python 3.8"
• d530e67 Revert "refactor module"
• 5bae77c Merge branch '20.x'
• d95ed44 point website to last version
• 0c3af6e Merge branch 'master' into 20.x
• f646bde fix bad cherry-picking
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #181.