chore(deps) Update dependency gunicorn to v21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gunicorn (source)	^20.1.0 -> ^21.0.0

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Release Notes

benoitc/gunicorn (gunicorn)

v21.2.0: Gunicorn 21.2.0 has been released

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Gunicorn 21.2.0 has been released. This version fix the issue introduced in the threaded worker.

Changes:

21.2.0 - 2023-07-19
===================
fix thread worker: revert change considering connection as idle .

*** NOTE ***

This is fixing the bad file description error.

1. Documentation is available there: https://docs.gunicorn.org/en/stable/news.html
2. Packages: https://pypi.org/project/gunicorn/

v21.1.0: Gunicorn 21.1.0 has been released

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gunicorn 21.1.0 has been released. This version fix the issue introduced in the threaded worker.

21.1.0 - 2023-07-18

• fix thread worker: fix socket removal from the queuet checkout 21.x

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: benoitc/gunicorn@21.0.0...21.0.1

v21.0.0

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[christopherpickering]

🎉 This PR is included in version 2.11.0-alpha.2 🎉

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[christopherpickering]

🎉 This PR is included in version 2.11.1-alpha.1 🎉

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[christopherpickering]

🎉 This PR is included in version 2.11.1 🎉

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