Bump jinja2 from 2.11.2 to 2.11.3

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.2 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.11.2...2.11.3)

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

requirements.txt

@@ -3,7 +3,7 @@ babel==2.9.0
 flask-babel==2.0.0
 flask==1.1.2
 idna==2.10
-jinja2==2.11.2
+jinja2==2.11.3
 lxml==4.6.2
 pygments==2.1.3
 python-dateutil==2.8.1