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](pallets/jinja@2.11.3...3.0.0)

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

requirements.txt

@@ -1,7 +1,7 @@
 certifi==2020.12.5
 chardet==4.0.0
 idna==3.1
-Jinja2==2.11.3
+Jinja2==3.0.0
 kinto-http==10.7.0
 lxml==4.6.3
 MarkupSafe==1.1.1