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Update flat-tree requirement from 3.4.0 to 4.0.1
Updates the requirements on [flat-tree](https://github.com/mafintosh/flat-tree-rs) to permit the latest version. - [Release notes](https://github.com/mafintosh/flat-tree-rs/releases) - [Changelog](https://github.com/datrs/flat-tree/blob/master/CHANGELOG.md) - [Commits](datrs/flat-tree@3.4.0...4.0.1) Signed-off-by: dependabot[bot] <support@dependabot.com>