Update exercises using the rand crate (#2126)

Author: senekor

exercises/practice/robot-name/.meta/example.rs

@@ -3,7 +3,7 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-use rand::Rng;
+use rand::{Rng, RngExt as _};
 
 fn generate_name<R: Rng>(rng: &mut R, used_names: &mut HashSet<String>) -> String {
     loop {

exercises/practice/robot-name/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2024"
 # The full list of available libraries is here:
 # https://github.com/exercism/rust-test-runner/blob/main/local-registry/Cargo.toml
 [dependencies]
-rand = "0.9"
+rand = "0.10"
 
 [lints.clippy]
 new_without_default = "allow"

exercises/practice/simple-cipher/.meta/example.rs

@@ -1,4 +1,4 @@
-use rand::Rng;
+use rand::RngExt as _;
 
 pub fn encode_random(s: &str) -> (String, String) {
     let mut r = rand::rng();

exercises/practice/simple-cipher/Cargo.toml

@@ -7,4 +7,4 @@ edition = "2024"
 # The full list of available libraries is here:
 # https://github.com/exercism/rust-test-runner/blob/main/local-registry/Cargo.toml
 [dependencies]
-rand = "0.9"
+rand = "0.10"