Bump pyyaml from 5.2 to 5.4.1

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.2 to 5.4.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/main/CHANGES)
- [Commits](yaml/pyyaml@5.2...5.4.1)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 setuptools
 requests
-pyyaml==5.2
+pyyaml==5.4.1
 python-coveralls
 pytest-cov<2.6
 memory_profiler