chore(deps): Depend on serde_core in cargo-platform (#15992)

`cargo-platform` does not make use of serde derive macros, thus it can
depend on `serde_core` instead of `serde` to speed up users' compile
times.

See the documentation of [`serde_core`](https://docs.rs/serde_core) for
more details.

Author: ehuss

Cargo.lock

@@ -89,7 +89,8 @@ same-file = "1.0.6"
 schemars = "1.0.4"
 security-framework = "3.3.0"
 semver = { version = "1.0.26", features = ["serde"] }
-serde = "1.0.219"
+serde = "1.0.220"
+serde_core = "1.0.220"
 serde-untagged = "0.1.7"
 serde-value = "0.7.0"
 serde_ignored = "0.1.12"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-platform"
-version = "0.3.1"
+version = "0.3.2"
 edition.workspace = true
 license.workspace = true
 rust-version.workspace = true
@@ -10,6 +10,11 @@ documentation = "https://docs.rs/cargo-platform"
 description = "Cargo's representation of a target platform."
 
 [dependencies]
+serde_core.workspace = true
+
+# serde v1.0.220 is the first version that released with `serde_core`.
+# This is required to avoid conflict with other `serde` users which may require an older version.
+[target.'cfg(any())'.dependencies]
 serde.workspace = true
 
 [lints]

crates/cargo-platform/Cargo.toml

@@ -140,22 +140,22 @@ impl Platform {
     }
 }
 
-impl serde::Serialize for Platform {
+impl serde_core::Serialize for Platform {
     fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>
     where
-        S: serde::Serializer,
+        S: serde_core::Serializer,
     {
         self.to_string().serialize(s)
     }
 }
 
-impl<'de> serde::Deserialize<'de> for Platform {
+impl<'de> serde_core::Deserialize<'de> for Platform {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
-        D: serde::Deserializer<'de>,
+        D: serde_core::Deserializer<'de>,
     {
         let s = String::deserialize(deserializer)?;
-        FromStr::from_str(&s).map_err(serde::de::Error::custom)
+        FromStr::from_str(&s).map_err(serde_core::de::Error::custom)
     }
 }