Bump gunicorn from 22.0.0 to 23.0.0 in /src/publishers

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
...

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

src/publishers/requirements.txt

@@ -3,7 +3,7 @@ Flask==3.0.3
 Flask-Cors==4.0.1
 Flask-RESTful==0.3.10
 gevent==24.2.1
-gunicorn==22.0.0
+gunicorn==23.0.0
 marshmallow==3.21.3
 marshmallow-enum==1.5.1
 oauth2client==4.1.3