Bump concurrently from 3.5.1 to 4.1.2 in /website (#6585)
Bumps [concurrently](https://github.com/kimmobrunfeldt/concurrently) from 3.5.1 to 4.1.2.
- [Release notes](https://github.com/kimmobrunfeldt/concurrently/releases)
- [Commits](https://github.com/kimmobrunfeldt/concurrently/compare/3.5.1...v4.1.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>