Use rustup run <toolchain>
instead of cargo +<toolchain>
#209
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Work around a rustup bug (rust-lang/rustup#3036) on Windows. (Unfortunately, the problem still exists if a workaround is not used: https://github.com/taiki-e/cargo-hack/actions/runs/6111021546/job/16585330408)
I had already addressed this in my other project about a year ago (taiki-e/cargo-minimal-versions@84848e3), but in this project it was delayed for a long time because the mechanism for testing compatibility with the old Cargo was a bit complicated.