Auto merge of #7277 - lzutao:bump-home, r=alexcrichton
Auto merge of #7277 - lzutao:bump-home, r=alexcrichton

Update home dependencies to v0.5

This home's release remove support for the old `.multirust`
directory. Also it fixes rustup_home and cargo_home implementation
when corresponding environment variables are absolute paths.

eminence/cargo,rust-lang/cargo,vojtechkral/cargo,rust-lang/cargo,nipunn1313/cargo,eminence/cargo,nipunn1313/cargo,nipunn1313/cargo,tshepang/cargo,rustyhorde/cargo,rust-lang/cargo,rustyhorde/cargo,tsurai/cargo,vojtechkral/cargo,rustyhorde/cargo,eminence/cargo,rustyhorde/cargo,tsurai/cargo,tshepang/cargo,tsurai/cargo,tsurai/cargo,vojtechkral/cargo,vojtechkral/cargo,eminence/cargo,tshepang/cargo,tsurai/cargo,rust-lang/cargo,nipunn1313/cargo,tshepang/cargo