CI: Use cargo install --locked
Unaccountably, this isn't the default.
Fixes failures like this one https://gitlab.torproject.org/Diziet/arti/-/jobs/361930 caused by this kind of thing https://github.com/rustsec/rustsec/issues/1000
Unaccountably, this isn't the default.
Fixes failures like this one https://gitlab.torproject.org/Diziet/arti/-/jobs/361930 caused by this kind of thing https://github.com/rustsec/rustsec/issues/1000