chore(deps): bump jinja2 in /tests/apps/python-flask

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.1 to 2.11.2.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.11.1...2.11.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

tests/apps/python-flask/requirements.txt

@@ -1,5 +1,5 @@
 Flask==1.1.2
-Jinja2==2.11.1
+Jinja2==2.11.2
 Werkzeug==1.0.1
 gunicorn==20.0.4