Depend on serde_core instead of serde (#6872)

Cargo.lock

@@ -3334,7 +3334,7 @@ dependencies = [
  "rustyline",
  "scoped-tls",
  "scopeguard",
- "serde",
+ "serde_core",
  "static_assertions",
  "strum",
  "strum_macros",
@@ -3373,8 +3373,8 @@ dependencies = [
  "rustpython-pylib",
  "rustpython-stdlib",
  "rustpython-vm",
- "serde",
  "serde-wasm-bindgen",
+ "serde_core",
  "wasm-bindgen",
  "wasm-bindgen-futures",
  "web-sys",

Cargo.toml

@@ -193,7 +193,7 @@ rand = "0.9"
 rand_core = { version = "0.9", features = ["os_rng"] }
 rustix = { version = "1.1", features = ["event"] }
 rustyline = "17.0.1"
-serde = { version = "1.0.225", default-features = false }
+serde = { package = "serde_core", version = "1.0.225", default-features = false, features = ["alloc"] }
 schannel = "0.1.28"
 scoped-tls = "1"
 scopeguard = "1"