Bump to asm toolchain to 1.94.0.

This will allow getting all the asm in shape for edition 2024.

Author: wt

cortex-m/asm-toolchain

@@ -1 +1 @@
-nightly-2021-12-16
+1.94.0

cortex-m/asm/lib.rs

@@ -30,12 +30,9 @@
 //!
 //! [linker plugin LTO]: https://doc.rust-lang.org/stable/rustc/linker-plugin-lto.html
 
-#![feature(asm)]
 #![no_std]
 #![crate_type = "staticlib"]
 #![deny(warnings)]
-// Don't warn about feature(asm) being stable on Rust >= 1.59.0
-#![allow(stable_features)]
 
 mod inline;