Update crates/oxc_allocator/src/clone_in.rs

Co-authored-by: overlookmotel <theoverlookmotel@gmail.com>

crates/oxc_allocator/src/clone_in.rs

@@ -63,7 +63,7 @@ impl<'alloc, T: Copy> CloneIn<'alloc> for Cell<T> {
 }
 
 impl<'old_alloc, 'new_alloc> CloneIn<'new_alloc> for &'old_alloc str {
-    type Cloned = &'new_alloc mut str;
+    type Cloned = &'new_alloc str;
     fn clone_in(&self, alloc: &'new_alloc Allocator) -> Self::Cloned {
         alloc.alloc_str(self)
     }