build

cargo: bump `git2` to 0.19.0 #12815

Job	Run time
Check protos	1m 1s
build (ubuntu-latest)	4m 35s
Build jj-lib without Git support	1m 26s
cargo-deny (advisories)	22s
Clippy check	2m 52s
build (macos-14)	3m 58s
Check that MkDocs can build the docs	29s
cargo-deny (bans licenses sources)	33s
build (windows-latest)	11m 59s
Check that MkDocs can build the docs with Poetry 1.8	30s
build (ubuntu-latest, --all-features)	5m 21s
Check formatting	21s
	33m 27s

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