Upgrade Rust to 1.52.0 (#17096)

* Upgrade Rust to 1.52.0
update nightly_version to newly pushed docker image
fix clippy lint errors
1.52 comes with grcov 0.8.0, include this version to script

* upgrade to Rust 1.52.1

* disabling Serum from downstream projects until it is upgraded to Rust 1.52.1

client/src/rpc_client.rs

@@ -2034,7 +2034,7 @@ mod tests {
         // Send erroneous parameter
         let blockhash: ClientResult<String> =
             rpc_client.send(RpcRequest::GetRecentBlockhash, json!(["parameter"]));
-        assert_eq!(blockhash.is_err(), true);
+        assert!(blockhash.is_err());
     }
 
     #[test]