Bump gunicorn from 21.2.0 to 22.0.0 in /src (#3646)

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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Author: dependabot[bot]

src/requirements.txt

@@ -1,6 +1,6 @@
 flask==3.0.3
 flask-talisman==1.1.0
-gunicorn==21.2.0
+gunicorn==22.0.0
 pytest==8.1.1
 pytest-watch==4.2.0
 pytest-cov==5.0.0