Bump requests from 2.18.4 to 2.20.0 in /apic_fabric_setup

Bumps [requests](https://github.com/requests/requests) from 2.18.4 to 2.20.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.18.4...v2.20.0)

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

apic_fabric_setup/requirements.txt

@@ -10,6 +10,6 @@ enum34==1.1.6
 idna==2.6
 ipaddress==1.0.18
 pycparser==2.18
-requests==2.18.4
+requests==2.20.0
 six==1.11.0
 urllib3==1.22