build

files: relax requirement of merge() inputs #12638

Job	Run time
Check protos	59s
build (ubuntu-latest)	4m 14s
Build jj-lib without Git support	1m 1s
cargo-deny (advisories)	26s
build (macos-14)	3m 16s
Clippy check	2m 32s
build (windows-latest)	8m 48s
cargo-deny (bans licenses sources)	28s
build (ubuntu-latest, --all-features)	5m 19s
Check that MkDocs can build the docs	26s
Check that MkDocs can build the docs with Poetry 1.8	32s
Check formatting	20s
	28m 21s

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