build(deps): update rand requirement from 0.8 to 0.9 (#1233)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

prost/Cargo.toml

@@ -29,7 +29,7 @@ prost-derive = { version = "0.13.4", path = "../prost-derive", optional = true }
 [dev-dependencies]
 criterion = { version = "0.5", default-features = false }
 proptest = "1"
-rand = "0.8"
+rand = "0.9"
 
 [[bench]]
 name = "varint"