Bump crossbeam-channel from 0.4.1 to 0.4.2 (#441)
Bump crossbeam-channel from 0.4.1 to 0.4.2 (#441)

Bumps [crossbeam-channel](https://github.com/crossbeam-rs/crossbeam) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/crossbeam-rs/crossbeam/releases)
- [Changelog](https://github.com/crossbeam-rs/crossbeam/blob/v0.4.2/CHANGELOG.md)
- [Commits](https://github.com/crossbeam-rs/crossbeam/compare/v0.4.1...v0.4.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alex/ct-tools,alex/ct-tools