build(deps): bump aarch64-cpu from ae8199e to e4c1f1a

Bumps [aarch64-cpu](https://github.com/rust-embedded/aarch64-cpu) from `ae8199e` to `e4c1f1a`.
- [Release notes](https://github.com/rust-embedded/aarch64-cpu/releases)
- [Commits](rust-embedded/aarch64-cpu@ae8199e...e4c1f1a)

---
updated-dependencies:
- dependency-name: aarch64-cpu
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>