chore(deps): bump rand from 0.8.3 to 0.8.4

Bumps [rand](https://github.com/rust-random/rand) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.3...0.8.4)

---
updated-dependencies:
- dependency-name: rand
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -84,4 +84,4 @@ features = ["derive"]
 build-fs-tree = "^0.3.0"
 maplit = "^1.0.2"
 pretty_assertions = "^0.7.2"
-rand = "^0.8.3"
+rand = "^0.8.4"