Bump gunicorn from 21.2.0 to 22.0.0 in /sample-apps/python (#94)

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
...

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

sample-apps/python/requirements.txt

@@ -1,7 +1,7 @@
 blinker==1.6.2
 click==8.1.7
 Flask==2.3.3
-gunicorn==21.2.0
+gunicorn==22.0.0
 itsdangerous==2.1.2
 Jinja2==3.1.3
 MarkupSafe==2.1.3