Auto merge of rust-lang#115617 - coastalwhite:bump-stdarch-riscv-intrinsics, r=Amanieu

Bump: Include RISC-V intrinsics for stdarch

This bumps the version of the `stdarch` submodule to the current master. Notably, it now includes intrinsics for the RISC-V Scalar Cryptographic and Bit Manipulation extensions.

r? `@Amanieu`

Author: bors