Rspack: Remove bincode dependency from rspack by way of turbo-unix-path (#98855)

https://github.com/vercel/next.js/pull/98440 unintentionally caused the
rspack `Cargo.lock` to become outdated because it added a `smallvec`
dependency to `turbo-unix-path`, which gets used by `next-taskless`.

We only really need `smallvec`'s `serde` and `bincode_impl` features
when used with turbo-tasks, so move the feature declaration there.

Cargo.toml

@@ -341,11 +341,9 @@ serde_qs = "1.1.1"
 serde_with = "3.18.0"
 sha2 = "0.10.2"
 smallvec = { version = "1.15.1", features = [
-  "serde",
   "const_generics",
   "union",
   "const_new",
-  "impl_bincode",
 ] }
 shrink-to-fit = "0.2.10"
 strsim = "0.11.1"

rspack/Cargo.lock

@@ -6758,6 +6758,9 @@ dependencies = [
 [[package]]
 name = "turbo-unix-path"
 version = "0.0.1"
+dependencies = [
+ "smallvec",
+]
 
 [[package]]
 name = "typenum"

turbopack/crates/turbo-tasks/Cargo.toml

@@ -53,7 +53,7 @@ scattered-collect = { workspace = true }
 serde = { workspace = true, features = ["rc", "derive"] }
 serde_json = { workspace = true }
 shrink-to-fit = { workspace = true, features = ["indexmap", "serde_json", "smallvec", "nightly"] }
-smallvec = { workspace = true }
+smallvec = { workspace = true, features = ["serde", "impl_bincode"] }
 thiserror = { workspace = true }
 tokio = { workspace = true, features = ["full"] }
 tokio-util = { workspace = true }