build

Add a `Commit::parent_tree()` helper #10927

Job	Run time
Check protos	31s
build (ubuntu-latest)	3m 37s
Check that MkDocs can build the docs	29s
build (macos-14)	4m 10s
Check that MkDocs can build the docs with Poetry 1.3.2	37s
Check formatting	13s
build (windows-latest)	7m 45s
build (ubuntu-latest, --all-features)	4m 38s
cargo-deny (advisories)	24s
Clippy check	2m 34s
cargo-deny (bans licenses sources)	27s
	25m 25s

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