build

tree: remove unsafe with `ouroboros` for self-referential iterators #7755

Job	Run time
Check protos	31s
build (ubuntu-latest)	4m 49s
Check that MkDocs can build the docs	26s
build (macos-13)	5m 25s
build (windows-latest)	7m 39s
Check that MkDocs can build the docs with Poetry 1.3.2	28s
build (ubuntu-latest, --all-features)	5m 38s
Check formatting	15s
cargo-deny (advisories)	27s
cargo-deny (bans licenses sources)	24s
Clippy check	3m 30s
	29m 32s

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