Bump requests from 2.9.1 to 2.20.0 in /scripts

Bumps [requests](https://github.com/requests/requests) from 2.9.1 to 2.20.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/requests/requests/compare/v2.9.1...v2.20.0)

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

scripts/requirements-simple.txt

@@ -1,4 +1,4 @@
-requests==2.9.1
+requests==2.20.0
 six==1.10.0
 PyYAML==3.11
 ujson==1.33