cargo: enable zlib-ng and fast sha1 in gix #16902

Job	Run time
Check protos	23s
build (ubuntu-latest)	4m 57s
Check formatting	19s
build (macos-13)	6m 11s
build (macos-14)	5m 42s
build (windows-latest)	11m 26s
build (ubuntu-latest, --all-features)	5m 58s
Build jj-lib without Git support	49s
cargo-deny (advisories)	25s
cargo-deny (bans licenses sources)	25s
Clippy check	2m 36s
Check that MkDocs can build the docs	11s
Check that MkDocs can build the docs with latest Python and uv	13s
	39m 35s

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