chore(deps-dev): bump isort from 5.8.0 to 5.9.1

Bumps [isort](https://github.com/pycqa/isort) from 5.8.0 to 5.9.1.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@5.8.0...5.9.1)

---
updated-dependencies:
- dependency-name: isort
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -39,7 +39,7 @@ flake8-debugger = "^4.0.0"
 flake8-fixme = "^1.1.1"
 flake8-isort = "^4.0.0"
 flake8-variables-names = "^0.0.4"
-isort = "^5.8.0"
+isort = "^5.9.1"
 pytest-cov = "^2.12.1"
 pytest-mock = "^3.5.1"
 pdoc3 = "^0.9.2"