Bump gunicorn from 21.2.0 to 22.0.0 in /src (#27)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/requirements.txt

@@ -4,4 +4,4 @@ pytz==2023.3
 sqlparse==0.5.0
 psycopg==3.1.14
 uvicorn==0.24.0.post1
-gunicorn==21.2.0
+gunicorn==22.0.0