build(deps): bump muldiv from 0.2.0 to 0.2.1

Bumps [muldiv](https://github.com/sdroege/rust-muldiv) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/sdroege/rust-muldiv/releases)
- [Changelog](https://github.com/sdroege/rust-muldiv/blob/master/CHANGELOG.md)
- [Commits](sdroege/rust-muldiv@0.2.0...0.2.1)

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