Auto merge of #60306 - RalfJung:xargo, r=alexcrichton
Auto merge of #60306 - RalfJung:xargo, r=alexcrichton

include rustc-std-workspace-alloc in rust-src

This is needed to fix https://github.com/japaric/xargo/issues/240

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