nit: Appease lint

Author: zurawiki

tiktoken-rs/src/vendor_tiktoken.rs

@@ -1,6 +1,6 @@
 // This check is new and seems buggy (possibly with PyO3 interaction)
 #![allow(clippy::borrow_deref_ref)]
-
+#![allow(non_local_definitions)]
 use std::collections::HashSet;
 use std::thread;