chore(deps): update astroid requirement from ~=2.8 to ~=2.9 (#661)

Updates the requirements on [astroid](https://github.com/PyCQA/astroid) to permit the latest version.
- [Release notes](https://github.com/PyCQA/astroid/releases)
- [Changelog](https://github.com/PyCQA/astroid/blob/main/ChangeLog)
- [Commits](pylint-dev/astroid@v2.8.0...v2.9.0)

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

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Pipfile

@@ -22,7 +22,7 @@ types-python-dateutil = "~=2.8"
 mock = "~=4.0"
 
 pylint = "~=2.11"
-astroid = "~=2.8"
+astroid = "~=2.9"
 isort = "~=5.10"
 
 mypy = "~=0.910"