build(deps): bump pyyaml from 5.3.1 to 5.4 (#273)

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.
- [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)

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

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

Author: dependabot[bot]

requirements.txt

@@ -102,7 +102,7 @@ python-dateutil==2.8.1
 python-dotenv==0.14.0
 pytoml==0.1.21
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.4
 pyzmq==19.0.2
 requests==2.24.0
 six==1.15.0