chore(deps): update dependency gunicorn to v20.1.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gunicorn (source)	==19.10.0 -> ==20.1.0
gunicorn (source)	==20.0.4 -> ==20.1.0

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Release Notes

benoitc/gunicorn

v20.1.0

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• document WEB_CONCURRENCY is set by, at least, Heroku
• capture peername from accept: Avoid calls to getpeername by capturing the peer name returned by
  accept
• log a warning when a worker was terminated due to a signal
• fix tornado usage with latest versions of Django
• add support for python -m gunicorn
• fix systemd socket activation example
• allows to set wsgi application in configg file using wsgi_app
• document --timeout = 0
• always close a connection when the number of requests exceeds the max requests
• Disable keepalive during graceful shutdown
• kill tasks in the gthread workers during upgrade
• fix latency in gevent worker when accepting new requests
• fix file watcher: handle errors when new worker reboot and ensure the list of files is kept
• document the default name and path of the configuration file
• document how variable impact configuration
• document the $PORT environment variable
• added milliseconds option to request_time in access_log
• added PIP requirements to be used for example
• remove version from the Server header
• fix sendfile: use socket.sendfile instead of os.sendfile
• reloader: use absolute path to prevent empty to prevent0 InotifyError when a file
  is added to the working directory
• Add --print-config option to print the resolved settings at startup.
• remove the --log-dict-config CLI flag because it never had a working format
  (the logconfig_dict setting in configuration files continues to work)

** Breaking changes **

• minimum version is Python 3.5
• remove version from the Server header

** Documentation **

** Others **

• miscellaneous changes in the code base to be a better citizen with Python 3
• remove dead code
• fix documentation generation

v20.0.4

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

v20.0.3

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• 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

v20.0.2

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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.

v20.0.1

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v20.0.0

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• Fixed fdopen RuntimeWarning in Python 3.8
• Added check and exception for str type on value in Response process_headers method.
• Ensure WSGI header value is string before conducting regex search on it.
• Added pypy3 to list of tested environments
• Grouped StopIteration and KeyboardInterrupt exceptions with same body together in Arbiter.run()
• Added setproctitle module to extras_require in setup.py
• Avoid unnecessary chown of temporary files
• Logging: Handle auth type case insensitively
• Removed util.import_module
• Removed fallback for types.SimpleNamespace in tests utils
• Use SourceFileLoader instead instead of execfile_
• Use importlib instead of __import__ and eval`
• Fixed eventlet patching
• Added optional datadog <https://www.datadoghq.com>_ tags for statsd metrics
• Header values now are encoded using latin-1, not ascii.
• Rewritten parse_address util added test
• Removed redundant super() arguments
• Simplify futures import in gthread module
• Fixed worker_connections` setting to also affects the Gthread worker type
• Fixed setting max_requests
• Bump minimum Eventlet and Gevent versions to 0.24 and 1.4
• Use Python default SSL cipher list by default
• handle wsgi.input_terminated extension
• Simplify Paste Deployment documentation
• Fix root logging: root and logger are same level.
• Fixed typo in ssl_version documentation
• Documented systemd deployement unit examples
• Added systemd sd_notify support
• Fixed typo in gthread.py
• Added tornado <https://www.tornadoweb.org/>_ 5 and 6 support
• Declare our setuptools dependency
• Added support to --bind to open file descriptors
• Document how to serve WSGI app modules from Gunicorn
• Provide guidance on X-Forwarded-For access log in documentation
• Add support for named constants in the --ssl-version flag
• Clarify log format usage of header & environment in documentation
• Fixed systemd documentation to properly setup gunicorn unix socket
• Prevent removal unix socket for reuse_port
• Fix ResourceWarning when reading a Python config module
• Remove unnecessary call to dict keys method
• Support str and bytes for UNIX socket addresses
• fixed InotifyReloadeder: handle module.__file__ is None
• /dev/shm as a convenient alternative to making your own tmpfs mount in fchmod FAQ
• fix examples to work on python3
• Fix typo in --max-requests documentation
• Clear tornado ioloop before os.fork
• Miscellaneous fixes and improvement for linting using Pylint

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