Bump isort from 5.9.0 to 5.9.1

Bumps [isort](https://github.com/pycqa/isort) from 5.9.0 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@5.9.0...5.9.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -28,7 +28,7 @@ camel-converter = "^1.0.0"
 [tool.poetry.dev-dependencies]
 black = "^21.6b0"
 flake8 = "^3.9.2"
-isort = "^5.9.0"
+isort = "^5.9.1"
 mypy = "^0.902"
 pre-commit = "^2.12.1"
 pytest = "^6.2.3"