Bump concurrently from 4.1.2 to 5.0.0 in /website (#6614)
Bumps [concurrently](https://github.com/kimmobrunfeldt/concurrently) from 4.1.2 to 5.0.0.
- [Release notes](https://github.com/kimmobrunfeldt/concurrently/releases)
- [Commits](https://github.com/kimmobrunfeldt/concurrently/compare/v4.1.2...v5.0.0)
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