Replace rand with rand_core where possible

Turns out rand_core offers OsRng.

processor/Cargo.toml

@@ -34,6 +34,5 @@ monero-serai = { path = "../coins/monero", features = ["multisig"] }
 
 [dev-dependencies]
 group = "0.12"
-rand = "0.8"
 futures = "0.3"
 tokio = { version = "1", features = ["full"] }

processor/src/coin/monero.rs

@@ -213,7 +213,7 @@ impl Coin for Monero {
 
   #[cfg(test)]
   async fn test_send(&self, address: Self::Address) {
-    use rand::rngs::OsRng;
+    use rand_core::OsRng;
 
     let height = self.get_height().await.unwrap();
 

processor/src/tests/mod.rs

@@ -6,7 +6,7 @@ use std::{
 
 use async_trait::async_trait;
 
-use rand::rngs::OsRng;
+use rand_core::OsRng;
 
 use crate::{
   NetworkError, Network,