build

nix: use `-ld_new` on macOS #12235

Job	Run time
Build jj-lib without Git support	39s
build (ubuntu-latest)	4m 12s
cargo-deny (advisories)	21s
build (macos-14)	3m 3s
cargo-deny (bans licenses sources)	22s
Check protos	26s
build (windows-latest)	7m 37s
build (ubuntu-latest, --all-features)	4m 54s
Clippy check	2m 24s
Check that MkDocs can build the docs	20s
Check that MkDocs can build the docs with Poetry 1.8	20s
Check formatting	19s
	24m 57s

Provide feedback