Bump gunicorn from 20.0.4 to 22.0.0 in /src/backend in the pip group across 1 directory

[dependabot]

Bumps the pip group with 1 update in the /src/backend directory: gunicorn.

Updates gunicorn from 20.0.4 to 22.0.0

Release notes

Sourced from gunicorn's releases.

Gunicorn 22.0 has been released

Gunicorn 22.0.0 has been released. This version fix the numerous security vulnerabilities. You're invited to upgrade asap your own installation.

Changes:

22.0.0 - 2024-04-17
===================

use utime to notify workers liveness
migrate setup to pyproject.toml
fix numerous security vulnerabilities in HTTP parser (closing some request smuggling vectors)
parsing additional requests is no longer attempted past unsupported request framing
on HTTP versions < 1.1 support for chunked transfer is refused (only used in exploits)
requests conflicting configured or passed SCRIPT_NAME now produce a verbose error
Trailer fields are no longer inspected for headers indicating secure scheme
support Python 3.12

** Breaking changes **

minimum version is Python 3.7
the limitations on valid characters in the HTTP method have been bounded to Internet Standards
requests specifying unsupported transfer coding (order) are refused by default (rare)
HTTP methods are no longer casefolded by default (IANA method registry contains none affected)
HTTP methods containing the number sign (#) are no longer accepted by default (rare)
HTTP versions < 1.0 or >= 2.0 are no longer accepted by default (rare, only HTTP/1.1 is supported)
HTTP versions consisting of multiple digits or containing a prefix/suffix are no longer accepted
HTTP header field names Gunicorn cannot safely map to variables are silently dropped, as in other software
HTTP headers with empty field name are refused by default (no legitimate use cases, used in exploits)
requests with both Transfer-Encoding and Content-Length are refused by default (such a message might indicate an attempt to perform request smuggling)
empty transfer codings are no longer permitted (reportedly seen with really old & broken proxies)

** SECURITY **

fix CVE-2024-1135

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

Gunicorn 21.2.0 has been released

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 .
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Commits

• f63d59e bump to 22.0
• 4ac81e0 Merge pull request #3175 from e-kwsm/typo
• 401cecf Merge pull request #3179 from dhdaines/exclude-eventlet-0360
• 0243ec3 fix(deps): exclude eventlet 0.36.0
• 628a0bc chore: fix typos
• 88fc4a4 Merge pull request #3131 from pajod/patch-py12-rebased
• deae2fc CI: back off the agressive timeout
• f470382 docs: promise 3.12 compat
• 5e30bfa add changelog to project.urls (updated for PEP621)
• 481c3f9 remove setup.cfg - overridden by pyproject.toml
• Additional commits viewable in compare view

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