cppgc-js: Fix TraitTrait for v8::TracedReference

Trait requires methods taking `const void*` as they are passed along
as regular TraceCallback.

Bug: v8:12165
Change-Id: Ic5cfb8dba070e5a2c0087069086c925c5318fb8b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3253354Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77623}

include/v8-cppgc.h

@@ -318,13 +318,13 @@ namespace cppgc {
 
 template <typename T>
 struct TraceTrait<v8::TracedReference<T>> {
-  static cppgc::TraceDescriptor GetTraceDescriptor(
-      const v8::TracedReference<T>* ref) {
+  static cppgc::TraceDescriptor GetTraceDescriptor(const void* self) {
     return {nullptr, Trace};
   }
 
-  static void Trace(Visitor* visitor, const v8::TracedReference<T>* self) {
-    static_cast<v8::JSVisitor*>(visitor)->Trace(*self);
+  static void Trace(Visitor* visitor, const void* self) {
+    static_cast<v8::JSVisitor*>(visitor)->Trace(
+        *static_cast<const v8::TracedReference<T>*>(self));
   }
 };