build

docs: fixed usage of old "checkout" command in contributing docs #10715

Job	Run time
Check protos	31s
cargo-deny (advisories)	26s
build (ubuntu-latest)	4m 23s
cargo-deny (bans licenses sources)	27s
build (macos-14)	3m 8s
Clippy check	2m 22s
build (windows-latest)	8m 7s
build (ubuntu-latest, --all-features)	5m 15s
Check that MkDocs can build the docs	25s
Check that MkDocs can build the docs with Poetry 1.3.2	40s
Check formatting	15s
	25m 59s

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