Bump gunicorn from 20.1.0 to 23.0.0 in /frameworks/Python/flask (TechEmpower#9710)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.1.0 to 23.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.1.0...23.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
...

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

Author: dependabot[bot]

frameworks/Python/flask/requirements-gunicorn.txt

@@ -1,4 +1,4 @@
 -r requirements.txt
 greenlet<0.5
-gunicorn==20.1.0
+gunicorn==23.0.0
 meinheld==1.0.2