Update rand_os requirement from 0.1 to 0.2 in /rust

Updates the requirements on [rand_os](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@rand_os-0.1.0...rand_os-0.2.2)

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

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

Author: dependabot[bot]

rust/Cargo.toml

@@ -38,15 +38,15 @@ serde = { version = "1.0", features = ["derive"] }
 
 # non-wasm
 [target.'cfg(not(all(target_arch = "wasm32", not(target_os = "emscripten"))))'.dependencies]
-rand_os = "0.1"
+rand_os = "0.2"
 noop_proc_macro = "0.3.0"
 getrandom = "0.2.3"
 
 # wasm
 [target.'cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))'.dependencies]
 serde-wasm-bindgen = "0.4.5"
 wasm-bindgen = "=0.2.83"
-rand_os = { version = "0.1", features = ["wasm-bindgen"] }
+rand_os = { version = "0.2", features = ["wasm-bindgen"] }
 js-sys = "0.3.51"
 getrandom = { version = "0.2.3", features = ["js"] }
 
@@ -57,7 +57,7 @@ opt-level = "s"
 [dev-dependencies]
 quickcheck = "0.9.2"
 quickcheck_macros = "0.9.1"
-rand_os = "0.1"
+rand_os = "0.2"
 rand_chacha = "0.1"
 
 [build-dependencies]