Bump rand from 0.8.5 to 0.8.6 in /legacy

Bumps [rand](https://github.com/rust-random/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: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

legacy/Cargo.lock

@@ -15,7 +15,7 @@ nix = "0.23.1"
 unicode-segmentation = "1.7.1"
 unicode_reader = "1"
 unicode-width = "0.1"
-rand = "0.8.3"
+rand = "0.8.6"
 walkdir = "2"
 same-file = "1.0.6"
 remove_dir_all = "0.8"