Add folder property to nodes and groups

Bump pyupgrade from 2.9.0 to 2.10.0 (#41)

Bumps [pyupgrade](https://github.com/asottile/pyupgrade) from 2.9.0 to 2.10.0.
- [Release notes](https://github.com/asottile/pyupgrade/releases)
- [Commits](https://github.com/asottile/pyupgrade/compare/v2.9.0...v2.10.0)

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