Bump jinja2 from 2.11.3 to 3.1.6

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.1.6.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.3...3.1.6)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-version: 3.1.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ black~=21.9b0
 csh-ldap==2.4.0
 click~=7.1.2
 flask==1.1.4
-jinja2==2.11.3
+jinja2==3.1.6
 flask-pyoidc==1.3.0
 gunicorn==20.0.4
 markupsafe==2.0.1