Bump jinja2 from 2.11.3 to 3.1.5 in /docs

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.1.5.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.3...3.1.5)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -10,7 +10,7 @@ joblib==1.1.1
 sphinx-py3doc-enhanced-theme==2.4.0
 nbsphinx==0.4.2
 nbconvert==6.0.7
-Jinja2==2.11.3
+Jinja2==3.1.5
 pillow==8.2.0
 sphinx==4.0.2
 markupsafe==2.0.1