build

nix: use `-ld_new` on macOS #12215

Job	Run time
Check protos	24s
cargo-deny (advisories)	22s
build (ubuntu-latest)	4m 0s
Build jj-lib without Git support	46s
cargo-deny (bans licenses sources)	23s
Clippy check	2m 25s
build (macos-14)	3m 2s
build (windows-latest)	7m 54s
Check that MkDocs can build the docs	25s
Check that MkDocs can build the docs with Poetry 1.8	28s
Check formatting	16s
build (ubuntu-latest, --all-features)	5m 0s
	25m 25s

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