Bumps [lru](https://github.com/jeromefroe/lru-rs) from 0.4.3 to 0.6.1.
- [Release notes](https://github.com/jeromefroe/lru-rs/releases)
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jeromefroe/lru-rs/compare/0.4.3...0.6.1)

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