Bump jinja2 from 3.1.2 to 3.1.5 in /docs

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.2 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@3.1.2...3.1.5)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -12,4 +12,4 @@ Pygments==2.7.4
 sphinxcontrib-matlabdomain==0.19.1
 docutils<0.17
 sphinx_rtd_theme==0.4.3
-jinja2==3.1.2
+jinja2==3.1.5