Switch serde dependency to serde_core (#3477)

axum-extra/src/extract/form.rs

@@ -5,7 +5,7 @@ use axum::{
 };
 use axum_core::__composite_rejection as composite_rejection;
 use axum_core::__define_rejection as define_rejection;
-use serde::de::DeserializeOwned;
+use serde_core::de::DeserializeOwned;
 
 /// Extractor that deserializes `application/x-www-form-urlencoded` requests
 /// into some type.

axum-extra/src/extract/json_deserializer.rs

@@ -4,7 +4,7 @@ use axum_core::__define_rejection as define_rejection;
 use axum_core::extract::rejection::BytesRejection;
 use bytes::Bytes;
 use http::{header, HeaderMap};
-use serde::Deserialize;
+use serde_core::Deserialize;
 use std::marker::PhantomData;
 
 /// JSON Extractor for zero-copy deserialization.

axum-extra/src/extract/optional_path.rs

@@ -2,7 +2,7 @@ use axum::{
     extract::{rejection::PathRejection, FromRequestParts, Path},
     RequestPartsExt,
 };
-use serde::de::DeserializeOwned;
+use serde_core::de::DeserializeOwned;
 
 /// Extractor that extracts path arguments the same way as [`Path`], except if there aren't any.
 ///

axum-extra/src/extract/query.rs

@@ -2,7 +2,7 @@ use axum::extract::FromRequestParts;
 use axum_core::__composite_rejection as composite_rejection;
 use axum_core::__define_rejection as define_rejection;
 use http::{request::Parts, Uri};
-use serde::de::DeserializeOwned;
+use serde_core::de::DeserializeOwned;
 
 /// Extractor that deserializes query strings into some type.
 ///