module: update pylint to version 2.9

Updates the requirements on [pylint](https://github.com/PyCQA/pylint) to permit the latest version (#45).
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](https://github.com/PyCQA/pylint/compare/pylint-2.8.0...v2.9.2)

---
updated-dependencies:
- dependency-name: pylint
  dependency-type: direct:development
...

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pyproject.toml

@@ -17,7 +17,7 @@ requests = "~2.25"
 
 [tool.poetry.dev-dependencies]
 mypy = "0.910"
-pylint = "~2.8"
+pylint = "~2.9"
 rope = "~0.19"
 types-PyYAML = "~5.4"
 types-requests = "~2.25"