rust: Update to 1.71.1

rust: Update to 1.71.1

Version 1.71.1 (2023-08-03)
===========================

- Fix CVE-2023-38497: Cargo did not respect the umask when extracting dependencies
- Fix bash completion for users of Rustup
- Do not show `suspicious_double_ref_op` lint when calling `borrow()`
- Fix ICE: substitute types before checking inlining compatibility
- Fix ICE: don't use `can_eq` in `derive(..)` suggestion for missing method
- Fix building Rust 1.71.0 from the source tarball

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>