Switch to `clippy_utils` on crates.io #310

Job	Run time
Check for typos	5s
extract-rust-version / Extract Rust version	3s
Build docs	1m 52s
Check with Clippy	1m 47s
Check with rustfmt	23s
Run tests (ubuntu-latest)	3m 42s
Run tests (windows-latest)	9m 28s
Run tests (macos-latest)	4m 35s
	21m 55s

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