[BUG] Regression in 0.8.0: Can’t use `#[event(start)]` without a direct `wasm-bindgen` dependency

### Is there an existing issue for this? - [x] I have searched the existing issues ### What version of `workers-rs` are you using? 0.8.0 ### What version of `wrangler` are you using? n/a ### Describe the bug After upgrading to v0.8, a start handler like this: ```rust #[event(start)] pub fn setup_hook() { // … } ``` in a crate that does not have `wasm-bindgen` as a dependency, will fail to compile: ``` error[E0433]: cannot find module or crate `wasm_bindgen` in this scope --> lib.rs:LL:1 | LL | #[event(start)] | ^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `wasm_bindgen` | = note: this error originates in the attribute macro `event` (in Nightly builds, run with -Z macro-backtrace for more info) For more information about this error, try `rustc --explain E0433`. error: could not compile `generate-newspaper-entry` (lib) due to 1 previous error ``` This is a consequence of [this change](https://github.com/cloudflare/workers-rs/commit/e363ba6#diff-5fbccf7aad8fecebdb79b59bcdf993ad2236c34b9360b7f6cc2862374497a610) where the import of `::worker::wasm_bindgen` was dropped. ### Steps To Reproduce Cargo.toml ```toml [package] name = "issue-973" version = "0.1.0" edition = "2024" [lib] crate-type = ["cdylib"] [dependencies] # Only `worker` — no direct `wasm-bindgen` dependency. # The `#[event(start)]` macro should re-export what it needs # via `::worker::wasm_bindgen`, but since 0.8.0 it doesn't. worker = "0.8.0" ``` src/lib.rs ```rust use worker::event; // Fails to compile with worker 0.8.0 because the `event` macro // emits a bare `wasm_bindgen` reference instead of `::worker::wasm_bindgen`. #[event(start)] pub fn setup_hook() {} ```