chore(deps): Bump jinja2 in /examples/knative/python/kn-py-slack

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.2 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@3.1.2...3.1.3)

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

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

examples/knative/python/kn-py-slack/requirements.txt

@@ -7,7 +7,7 @@ Flask==2.3.2
   importlib-metadata==4.11.4
     zipp==3.8.0
   itsdangerous==2.1.2
-  Jinja2==3.1.2
+  Jinja2==3.1.3
     MarkupSafe==2.1.1
   Werkzeug==3.0.1
 pip==23.3