misc(kernel): remove the trait_upcasting feature

The feature now has been stabalized.

Signed-off-by: Anhad Singh <[email protected]>

Author: Andy-Python-Programmer

src/aero_kernel/src/main.rs

@@ -45,7 +45,6 @@
     const_trait_impl, // https://github.com/rust-lang/rust/issues/67792
     int_roundings, // https://github.com/rust-lang/rust/issues/88581
     const_ptr_is_null, // https://github.com/rust-lang/rust/issues/74939
-    trait_upcasting, // https://github.com/rust-lang/rust/issues/65991
     naked_functions, // https://github.com/rust-lang/rust/issues/32408
     cfg_match, // https://github.com/rust-lang/rust/issues/115585
     strict_provenance,