Bump pyyaml from 3.13 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 3.13 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/main/CHANGES)
- [Commits](yaml/pyyaml@3.13...5.4)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-version: '5.4'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -9,6 +9,6 @@ pycodestyle==2.4.0
 pynliner==0.8.0
 Babel==2.6.0
 bleach==3.1.4
-PyYAML==3.13
+PyYAML==5.4
 zstandard==0.23.0
 rpmfile==2.1.0