chore(deps): update git2 to use libgit2 1.9 #2299

Job	Run time
Rustfmt	6s
Clippy	36s
Code coverage	2m 39s
Integration tests (macos-latest)	1m 51s
Integration tests (ubuntu-latest)	2m 14s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 8s
Unit tests (macos-13, x86_64-apple-darwin, false)	4m 9s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	5m 27s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 13s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 40s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 38s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 8s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	2m 50s
	32m 39s

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