Bump gunicorn from 22.0.0 to 23.0.0 in /src (#4043)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 22.0.0 to 23.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@22.0.0...23.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/requirements.txt

@@ -1,6 +1,6 @@
 flask==3.1.0
 flask-talisman==1.1.0
-gunicorn==22.0.0
+gunicorn==23.0.0
 pytest==8.2.2
 pytest-watch==4.2.0
 pytest-cov==6.0.0