Bump isort from 5.5.4 to 5.6.1

Bumps [isort](https://github.com/pycqa/isort) from 5.5.4 to 5.6.1.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.5.4...5.6.1)

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Author: dependabot-preview[bot]