Auto merge of #43091 - aidanhs:aphs-no-docker-priv, r=alexcrichton

Privileged in docker run isn't necessary

Added relatively recently in https://github.com/rust-lang/rust/pull/40199/files#diff-71609a365528e4649836825d8250c241R57, but I don't see anything in that PR that requires it. If it's not strictly necessary, we shouldn't use it.

(if this lands I'll make a PR against libc which also uses privileged)

r? @alexcrichton