Update hashbrown requirement from 0.7.0 to 0.8.0
Update hashbrown requirement from 0.7.0 to 0.8.0

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
- [Release notes](https://github.com/rust-lang/hashbrown/releases)
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/hashbrown/compare/v0.7.0...v0.8.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
CryZe/livesplit-core,CryZe/livesplit-core