Bump jinja2 from 2.11.1 to 2.11.3 in /sync

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.1 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/2.11.1...2.11.3)
Signed-off-by: Ndependabot[bot] <support@github.com>

sync/requirements.txt

 wget==3.2
 ruamel.yaml==0.16.12
 google-cloud-storage==1.23.0
-Jinja2==2.11.1
+Jinja2==2.11.3
 google-auth==1.14.0
 urlopen==1.0.0
 markdown==3.1.1