Bump requests from 2.18.4 to 2.20.0 in /package

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>

Author: dependabot[bot]

package/requirements.txt

@@ -1,5 +1,5 @@
 lxml==3.8.0
-requests==2.18.4
+requests==2.20.0
 cloudshell-automation-api>=9.0.0.0,<9.0.1.0
 cloudshell-shell-core>=3.1.0,<3.2.0
 pyvmomi==6.5.0