Bump jinja2 from 3.1.5 to 3.1.6 in /doc/docportal

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.5 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@3.1.5...3.1.6)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: indirect
...

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

Author: dependabot[bot]

doc/docportal/requirements.txt

@@ -21,7 +21,7 @@ idna==3.10
     # via requests
 imagesize==1.4.1
     # via sphinx
-jinja2==3.1.5
+jinja2==3.1.6
     # via sphinx
 markupsafe==3.0.2
     # via jinja2