Update gunicorn to 23.0.0

[pyup-bot]

This PR updates gunicorn from 22.0.0 to 23.0.0.

Changelog

23.0.0

===================

- minor docs fixes (:pr:`3217`, :pr:`3089`, :pr:`3167`)
- worker_class parameter accepts a class (:pr:`3079`)
- fix deadlock if request terminated during chunked parsing (:pr:`2688`)
- permit receiving Transfer-Encodings: compress, deflate, gzip (:pr:`3261`)
- permit Transfer-Encoding headers specifying multiple encodings. note: no parameters, still (:pr:`3261`)
- sdist generation now explicitly excludes sphinx build folder (:pr:`3257`)
- decode bytes-typed status (as can be passed by gevent) as utf-8 instead of raising `TypeError` (:pr:`2336`)
- raise correct Exception when encounting invalid chunked requests (:pr:`3258`)
- the SCRIPT_NAME and PATH_INFO headers, when received from allowed forwarders, are no longer restricted for containing an underscore (:pr:`3192`)
- include IPv6 loopback address ``[::1]`` in default for :ref:`forwarded-allow-ips` and :ref:`proxy-allow-ips` (:pr:`3192`)

** NOTE **

- The SCRIPT_NAME change mitigates a regression that appeared first in the 22.0.0 release
- Review your :ref:`forwarded-allow-ips` setting if you are still not seeing the SCRIPT_NAME transmitted
- Review your :ref:`forwarder-headers` setting if you are missing headers after upgrading from a version prior to 22.0.0

** Breaking changes **

- refuse requests where the uri field is empty (:pr:`3255`)
- refuse requests with invalid CR/LR/NUL in heade field values (:pr:`3253`)
- remove temporary ``--tolerate-dangerous-framing`` switch from 22.0 (:pr:`3260`)
- If any of the breaking changes affect you, be aware that now refused requests can post a security problem, especially so in setups involving request pipe-lining and/or proxies.

Links

• PyPI: https://pypi.org/project/gunicorn
• Changelog: https://data.safetycli.com/changelogs/gunicorn/