build

refactor: Roll our own hex utils #14580

Job	Run time
Check protos	28s
Build jj-lib without Git support	43s
Check that MkDocs can build the docs	21s
build (ubuntu-latest)	4m 26s
build (macos-13)	6m 36s
Check that MkDocs can build the docs with Poetry 1.8	25s
build (macos-14)	4m 30s
build (windows-latest)	10m 30s
build (ubuntu-latest, --all-features)	5m 18s
Check formatting	14s
cargo-deny (advisories)	21s
Clippy check	2m 33s
cargo-deny (bans licenses sources)	22s
	36m 47s

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