Bump pyyaml from 5.3.1 to 5.4.1 (#243)

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.3.1...5.4.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 Click==7.1.2
 pytz==2020.4
-PyYAML==5.3.1
+PyYAML==5.4.1
 requests==2.25.0
 requests-hawk==1.0.1
 tabulate==0.8.7