Auto merge of #52154 - alexcrichton:beta-stdsimd, r=gnzlbg

[beta] Update stdsimd submodule

This commit updates the `stdsimd` module on the beta branch to pull in a fix for
rust-lang/stdarch#500, a bug which affects the stable 1.27.0 release
which causes feature detection on x86 to cause an illegal instruction on some
CPUs.