Bump jinja2 from 2.11.3 to 3.0.0

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.0.0.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.11.3...3.0.0)

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

requirements.txt

@@ -2,7 +2,7 @@ certifi==2020.12.05
 babel==2.9.1
 flask-babel==2.0.0
 flask==1.1.2
-jinja2==2.11.3
+jinja2==3.0.0
 lxml==4.6.3
 pygments==2.8.1
 python-dateutil==2.8.1