build

cargo: bump `git2` to 0.19.0 #12819

Job	Run time
build (ubuntu-latest)	4m 27s
Build jj-lib without Git support	45s
build (macos-14)	3m 13s
build (windows-latest)	10m 32s
Check protos	30s
build (ubuntu-latest, --all-features)	5m 22s
Check that MkDocs can build the docs	29s
Check formatting	15s
cargo-deny (advisories)	21s
cargo-deny (bans licenses sources)	22s
Clippy check	2m 34s
Check that MkDocs can build the docs with Poetry 1.8	25s
	29m 15s

Provide feedback