Bump jinja2 from 3.1.5 to 3.1.6 in the flask group

Bumps the flask group with 1 update: [jinja2](https://github.com/pallets/jinja).


Updates `jinja2` 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: direct:development
  update-type: version-update:semver-patch
  dependency-group: flask
...

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

requirements-dev.txt

@@ -24,7 +24,7 @@ iniconfig==2.0.0
     # via pytest
 itsdangerous==2.2.0
     # via flask
-jinja2==3.1.5
+jinja2==3.1.6
     # via
     #   ccs-govuk-frontend-jinja (pyproject.toml)
     #   flask