Bump gunicorn from 21.2.0 to 22.0.0 in the pip group

Bumps the pip group with 1 update: [gunicorn](https://github.com/benoitc/gunicorn).


Updates `gunicorn` from 21.2.0 to 22.0.0
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@21.2.0...22.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@ anyio==4.3.0
 certifi==2024.2.2
 charset-normalizer==3.3.2
 flake8==7.0.0
-gunicorn==21.2.0
+gunicorn==22.0.0
 h11==0.14.0
 httpcore==1.0.5
 httpx==0.27.0