Tests use deprecated `snapbox::cmd::cargo_bin` which will break on future Cargo versions

https://github.com/cargo-lambda/cargo-lambda/blob/bc645a504be9c0de7f66fa58d6f03ffdaf83b1cb/crates/cargo-lambda-cli/tests/harness/mod.rs#L138
`cargo_bin` relies on implementation details of cargo that will soon break (rust-lang/cargo#16147, rust-lang/cargo#15010)