module: update types-pyyaml to version 6.0

Updates the requirements on [types-pyyaml](https://github.com/python/typeshed) to permit the latest version (#51).
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-pyyaml
  dependency-type: direct:development
...

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pyproject.toml

@@ -19,7 +19,7 @@ requests = "~2.26"
 mypy = "0.910"
 pylint = "~2.11"
 rope = "~0.20"
-types-PyYAML = "~5.4"
+types-PyYAML = "~6.0"
 types-requests = "~2.25"
 yapf = "~0.31"