Bump jinja2 from 3.1.5 to 3.1.6 in /app/backend (Azure-Samples#2435)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -152,7 +152,7 @@ itsdangerous==2.2.0
     # via
     #   flask
     #   quart
-jinja2==3.1.5
+jinja2==3.1.6
     # via
     #   flask
     #   prompty