Rollup merge of #50081 - GuillaumeGomez:stdsimd-update, r=alexcrichton
Rollup merge of #50081 - GuillaumeGomez:stdsimd-update, r=alexcrichton

Update stdsimd submodule

aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust