Replace rustls with boring-ssl

This removes all re-attempts present in monero-serai's RPC and is an attempt to
narrow down the sporadic failures.

Inspired by hyperium/hyper#3427

Cargo.toml

@@ -93,3 +93,5 @@ lazy_static = { git = "https://github.com/rust-lang-nursery/lazy-static.rs", rev
 # subxt *can* pull these off crates.io yet there's no benefit to this
 sp-core-hashing = { git = "https://github.com/serai-dex/substrate" }
 sp-std = { git = "https://github.com/serai-dex/substrate" }
+
+hyper-boring = { git = "https://github.com/cloudflare/boring", rev = "423c260d87b69a926594ded0dd693b5cf1220452" }

coins/bitcoin/src/rpc.rs

@@ -6,7 +6,7 @@ use thiserror::Error;
 use serde::{Deserialize, de::DeserializeOwned};
 use serde_json::json;
 
-use simple_request::{hyper, Request, Client};
+use simple_request::{hyper, Full, Request, Client};
 
 use bitcoin::{
   hashes::{Hash, hex::FromHex},
@@ -111,11 +111,11 @@ impl Rpc {
     let mut request = Request::from(
       hyper::Request::post(&self.url)
         .header("Content-Type", "application/json")
-        .body(
+        .body(Full::new(
           serde_json::to_vec(&json!({ "jsonrpc": "2.0", "method": method, "params": params }))
             .unwrap()
             .into(),
-        )
+        ))
         .unwrap(),
     );
     request.with_basic_auth();