Rollup merge of #148226 - cuviper:bootstrap-update, r=Mark-Simulacrum

Bootstrap update

- Update CURRENT_RUSTC_VERSION post-bump
- Bump stage0 to 1.92.0-beta.1
- Update `#[cfg(bootstrap)]`

Author: matthiaskrgr

src/lib.rs

@@ -17,7 +17,7 @@
 #![feature(derive_coerce_pointee)]
 #![feature(arbitrary_self_types)]
 #![feature(iter_advance_by)]
-#![cfg_attr(not(bootstrap), feature(duration_from_nanos_u128))]
+#![feature(duration_from_nanos_u128)]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,