tests/debuginfo/basic-stepping.rs: Remove ignore-aarch64

It works now.

Author: Enselic

tests/debuginfo/basic-stepping.rs

@@ -2,7 +2,6 @@
 //! time works intuitively, e.g. that `next` takes you to the next source line.
 //! Regression test for <https://github.com/rust-lang/rust/issues/33013>.
 
-//@ ignore-aarch64: Doesn't work yet.
 //@ ignore-loongarch64: Doesn't work yet.
 //@ ignore-riscv64: Doesn't work yet.
 //@ ignore-backends: gcc