[Security] Bump jinja2 from 2.11.2 to 2.11.3 (#1354)

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.2 to 2.11.3. **This update includes a security fix.**
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](pallets/jinja@2.11.2...2.11.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements.txt

@@ -32,7 +32,7 @@ six == 1.15.0
 pydantic == 1.8.1
 pycountry == 20.7.3
 Flask==1.1.2
-Jinja2==2.11.2
+Jinja2==2.11.3
 werkzeug==1.0.1
 Flask-DebugToolbar==0.11.0
 Flask-UUID==0.2