Bump rand from 0.8.4 to 0.8.6 in /learn/rust/guessing_game

Bump rand from 0.8.4 to 0.8.6 in /learn/rust/guessing_game

Bumps [rand](https://github.com/rust-random/rand) from 0.8.4 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](https://github.com/rust-random/rand/compare/0.8.4...0.8.6)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.8.6
  dependency-type: direct:production
...

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