build(deps-dev): bump isort from 5.8.0 to 5.9.1 (#147)

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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -32,7 +32,7 @@ flake8-black = "^0.2.1"
 flake8-bugbear = "^21.4.3"
 flake8-isort = "^4.0.0"
 flake8-pyi = "^20.10.0"
-isort = "^5.8.0"
+isort = "^5.9.1"
 mypy = "^0.902"
 pytest = "^6.2.4"
 pytest-cov = "^2.12.1"