Bump isort from 5.6.4 to 5.7.0 (#282)

Bumps [isort](https://github.com/pycqa/isort) from 5.6.4 to 5.7.0.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.6.4...5.7.0)

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