fix build with rust 1.89

cf https://bugzilla.mozilla.org/show_bug.cgi?id=1982003
Index: third_party/rust/allocator-api2/src/stable/vec/mod.rs
--- third_party/rust/allocator-api2/src/stable/vec/mod.rs.orig
+++ third_party/rust/allocator-api2/src/stable/vec/mod.rs
@@ -51,6 +51,8 @@
 //!
 //! [`push`]: Vec::push
 
+#![warn(dangerous_implicit_autorefs)]
+
 #[cfg(not(no_global_oom_handling))]
 use core::cmp;
 use core::cmp::Ordering;
