Bump pyyaml from 5.3.1 to 5.4.1

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)

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

Author: dependabot-preview[bot]

Pipfile

@@ -22,7 +22,7 @@ docutils = "*"
 jmespath = "==0.10.0"
 pyaml = "==20.4.0"
 python-dateutil = "==2.8.1"
-PyYAML = "==5.3.1"
+PyYAML = "==5.4.1"
 
 [pipenv]
 allow_prereleases = true