use dep: tag to tell cargo that the serde_impl feature should pull in serde as a dep

Author: xacrimon

Cargo.toml

@@ -15,7 +15,7 @@ rust-version = "1.65"
 circle-ci = { repository = "kyren/hashlink", branch = "master" }
 
 [features]
-serde_impl = ["serde"]
+serde_impl = ["dep:serde"]
 
 [dependencies]
 hashbrown = { version = "0.15", default-features = false, features = ["default-hasher", "inline-more"] }