Update rand requirement from 0.8.0 to 0.9.0 (#72)

Updates the requirements on [rand](https://github.com/rust-random/rand) to permit the latest version.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.0...0.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.toml

@@ -16,5 +16,5 @@ keywords = ["binaryen", "webassembly", "wasm", "compiler"]
 binaryen-sys = { path = "binaryen-sys", version = "0.13.0" }
 
 [dev-dependencies]
-rand = "0.8.0"
+rand = "0.9.0"
 wat = "1.0"