Bump requests from 2.13.0 to 2.20.0 in /cwl-workflows

Bumps [requests](https://github.com/requests/requests) from 2.13.0 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/v2.13.0...v2.20.0)

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