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[bot] <support@github.com>

requirements.txt

@@ -1,6 +1,6 @@
 requests==2.24.0
 colorama==0.4.4
-PyYAML==5.3.1
+PyYAML==5.4.1
 backoff==1.10.0
 analytics-python==1.2.9
 typing-extensions==3.7.4.2