build(deps): bump predicates from 1.0.7 to 1.0.8

Bumps [predicates](https://github.com/assert-rs/predicates-rs) from 1.0.7 to 1.0.8.
- [Release notes](https://github.com/assert-rs/predicates-rs/releases)
- [Changelog](https://github.com/assert-rs/predicates-rs/blob/master/CHANGELOG.md)
- [Commits](assert-rs/predicates-rs@v1.0.7...v1.0.8)

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