lib: update clippy lint name in allow

```
error: lint `clippy::thread_local_initializer_can_be_made_const` has been renamed to `clippy::missing_const_for_thread_local`
  --> src/lib.rs:57:13
   |
57 |     #[allow(clippy::thread_local_initializer_can_be_made_const)]
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::missing_const_for_thread_local`
   |
   = note: `-D renamed-and-removed-lints` implied by `-D warnings`
   = help: to override `-D warnings` add
   `#[allow(renamed_and_removed_lints)]
```

Author: cpu

src/lib.rs

@@ -54,7 +54,7 @@ include!(concat!(env!("OUT_DIR"), "/version.rs"));
 // Rust code, we model these thread locals as a stack, so we can always
 // restore the previous version.
 thread_local! {
-    #[allow(clippy::thread_local_initializer_can_be_made_const)]
+    #[allow(clippy::missing_const_for_thread_local)]
     pub(crate) static USERDATA: RefCell<Vec<Userdata>> = RefCell::new(Vec::new());
 }