Bump jinja2 from 3.1.2 to 3.1.6 in /docs (#246)

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.2 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@3.1.2...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marcel Wallschläger <marcel.wallschlaeger@zalf.de>

Author: dependabot[bot]

docs/requirements.txt

@@ -12,7 +12,7 @@ griffe==0.22.0
     # via mkdocstrings-python
 importlib-metadata==4.12.0
     # via mkdocs
-jinja2==3.1.2
+jinja2==3.1.6
     # via
     #   mkdocs
     #   mkdocstrings