Remove a pair of unused structs/deps

Caught by the most recent nightly.

Cargo.lock

@@ -8404,7 +8404,6 @@ dependencies = [
  "serai-message-queue-tests",
  "serai-processor",
  "serai-processor-messages",
- "serde",
  "serde_json",
  "tokio",
  "zeroize",

networks/monero/rpc/src/lib.rs

@@ -174,8 +174,6 @@ impl FeePriority {
   }
 }
 
-#[derive(Debug, Deserialize)]
-struct EmptyResponse {}
 #[derive(Debug, Deserialize)]
 struct JsonRpcResponse<T> {
   result: T,

substrate/abi/src/tx.rs

@@ -83,7 +83,7 @@ impl<Call: 'static + TransactionMember + From<crate::Call>, Extra: 'static + Tra
 #[cfg(feature = "serde")]
 mod _serde {
   use scale::Encode;
-  use serde::{ser::*, de::*};
+  use serde::ser::*;
   use super::*;
   impl<Call: 'static + TransactionMember + From<crate::Call>, Extra: 'static + TransactionMember>
     Serialize for Transaction<Call, Extra>
@@ -93,6 +93,9 @@ mod _serde {
       serializer.serialize_bytes(&encoded)
     }
   }
+
+  #[cfg(feature = "std")]
+  use serde::de::*;
   #[cfg(feature = "std")]
   impl<
       'a,

substrate/signals/pallet/src/lib.rs

@@ -14,6 +14,8 @@ pub mod pallet {
   use sp_io::hashing::blake2_256;
 
   use frame_system::pallet_prelude::*;
+  // False positive
+  #[allow(unused)]
   use frame_support::{pallet_prelude::*, sp_runtime};
 
   use serai_primitives::*;

tests/processor/Cargo.toml

@@ -42,7 +42,6 @@ serai-db = { path = "../../common/db", default-features = false }
 serai-message-queue = { path = "../../message-queue" }
 
 borsh = { version = "1", features = ["de_strict_order"] }
-serde = { version = "1", default-features = false }
 serde_json = { version = "1", default-features = false }
 
 tokio = { version = "1", features = ["time"] }

tests/processor/src/lib.rs

@@ -160,9 +160,6 @@ pub fn processor_stack(
   )
 }
 
-#[derive(serde::Deserialize, Debug)]
-struct EmptyResponse {}
-
 pub struct Coordinator {
   network: NetworkId,