Support forwarding subcommand locate-project please

[NobodyXu]

cargo-hack v0.6.12 uses cargo locate-project, when trying to use cargo-hack with cargo-zigbuild by doing:

export CARGO=cargo-zigbuild
cargo-hack hack check ...

It will failed with:

error: process didn't exit successfully: `cargo-zigbuild locate-project` (exit status: 2)
--- stderr
error: The subcommand 'locate-project' wasn't recognized

This happens in our CI and it suddenly breaks due to new release from cargo-hack.

[NobodyXu]

Thank you!