Pass --locked
when installing rustfmt in integration tests
#5385
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There was recently an issue where
cargo install
was installing a newer version of a dependency than the one listed in our Cargo.toml. The newer version added deprecation warnings that caused our continuous integration tests to break.As mentioned in the
cargo help install
docs, passing the--locked
flag should force cargo to use theCargo.lock
file included with the repository.ref: #5384 (comment)