Bump jinja2 from 2.11.3 to 3.1.3 in /docs

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.1.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.3...3.1.3)

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

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

Author: dependabot[bot]

docs/requirements.in

@@ -2,5 +2,5 @@ sphinx
 docutils
 sphinx-autobuild
 sphinxcontrib-plantuml
-jinja2<3.0
+jinja2<4.0
 markupsafe<2.1

docs/requirements.txt

@@ -22,7 +22,7 @@ idna==3.6
     # via requests
 imagesize==1.4.1
     # via sphinx
-jinja2==2.11.3
+jinja2==3.1.3
     # via
     #   -r requirements.in
     #   sphinx