xous: sync: remove `rustc_const_stable` attribute on Condvar and Mutex new()
These functions had `#[rustc_const_stable(feature = "const_locks", since = "1.63.0")]` on them because they were originally taken from `no_threads`. with
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| .. | ||
| benches | ||
| src | ||
| tests | ||
| build.rs | ||
| Cargo.toml | ||