chore(deps): bump rand

Bumps the cargo group with 1 update in the /dashboard directory: [rand](https://github.com/rust-random/rand).


Updates `rand` from 0.8.5 to 0.8.6
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/0.8.6/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.5...0.8.6)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.8.6
  dependency-type: indirect
  dependency-group: cargo
...

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Author: dependabot[bot]