[Security] Bump color-string from 1.5.3 to 1.6.0

Bumps [color-string](https://github.com/Qix-/color-string) from 1.5.3 to 1.6.0. **This update includes a security fix.**
- [Release notes](https://github.com/Qix-/color-string/releases)
- [Changelog](https://github.com/Qix-/color-string/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Qix-/color-string/commits/1.6.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>