Bump git2 from 0.18.3 to 0.19.0 #7938

Job	Run time
build-apple-x86 (nightly)	5m 12s
build-linux-musl (nightly)	3m 48s
build-apple-x86 (stable)	4m 44s
build-linux-arm (nightly)	7m 20s
build-linux-musl (stable)	7m 53s
build (ubuntu-latest, nightly)	2m 47s
build-apple-x86 (1.70)	4m 48s
build-linux-arm (stable)	6m 38s
build-linux-musl (1.70)	8m 11s
build (ubuntu-latest, stable)	2m 39s
build-linux-arm (1.70)	6m 51s
build (ubuntu-latest, 1.70)	3m 20s
Lints	43s
Changelog Test	5s
build (macos-latest, nightly)	3m 3s
udeps	2m 23s
build (macos-latest, stable)	3m 22s
build (macos-latest, 1.70)	3m 24s
build (windows-latest, nightly)	6m 24s
build (windows-latest, stable)	6m 1s
build (windows-latest, 1.70)	8m 38s
	1h 38m 14s

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