Remove an excessive #[track_caller]

As pointed out in #126557 (comment)

Co-authored-by: Jonas Böttiger <jonasboettiger@icloud.com>

library/alloc/src/collections/vec_deque/mod.rs

@@ -492,7 +492,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// Frobs the head and tail sections around to handle the fact that we
     /// just reallocated. Unsafe because it trusts old_capacity.
     #[inline]
-    #[track_caller]
     unsafe fn handle_capacity_increase(&mut self, old_capacity: usize) {
         let new_capacity = self.capacity();
         debug_assert!(new_capacity >= old_capacity);