Update dependency gunicorn to v21

This MR contains the following updates:

Package	Update	Change
gunicorn (source)	major	==20.1.0 -> ==21.0.1

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Release Notes

benoitc/gunicorn

v21.0.1: Gunicorn 21 has been released

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Gunicorn 21 is out with miscellaneous changes. Enjoy!

We made this release major to start our new release cycle. More info will be provided on our discussion forum.

21.0.1 - 2023-07-17

fix documentation build

21.0.0 - 2023-07-17

support python 3.11 fix gevent and eventlet workers fix threads support (gththread): improve performance and unblock requests SSL: noaw use SSLContext object HTTP parser: miscellaneous fixes remove unecessary setuid calls fix testing improve logging miscellaneous fixes to core engine

Full Changelog: https://github.com/benoitc/gunicorn/compare/21.0.0...21.0.1

v21.0.0

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