Bump pyyaml from 5.1 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.1 to 5.4.
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.1...5.4)

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

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

requirements.txt

@@ -4,7 +4,7 @@ flask[async]==2.2
 inflection==0.3.1
 jsonschema==4.0.1
 PyJWT==2.4.0
-PyYAML==5.1
+PyYAML==5.4
 requests==2.31.0
 starlette==0.27.0
 werkzeug==2.2.3