Bump gunicorn from 21.2.0 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/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
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -6,7 +6,7 @@ chardet==5.2.0
 charset-normalizer==3.3.2
 dj-database-url==2.1.0
 Django==4.2.11
-gunicorn==21.2.0
+gunicorn==22.0.0
 idna==3.7
 psycopg==3.1.18
 psycopg-binary==3.1.18