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Enable `unstable-sha256` for `git2` (#3001) #10538

Job	Run time
udeps	8m 27s
Test Homebrew Formula (macOS)	6m 22s
build-apple-x86 (1.88)	9m 7s
build (ubuntu-latest, stable)	7m 49s
Lints	2m 19s
build-linux-arm (nightly)	19m 24s
build-linux-musl (stable)	6m 26s
build-linux-musl (nightly)	9m 23s
build-linux-arm (stable)	19m 1s
build-linux-musl (1.88)	10m 4s
build-apple-x86 (nightly)	8m 27s
build-linux-arm (1.88)	14m 6s
Changelog Test	5s
build (ubuntu-latest, nightly)	5m 37s
build-apple-x86 (stable)	5m 18s
build (macos-latest, nightly)	13m 10s
build (macos-latest, stable)	11m 49s
build (windows-latest, nightly)	28m 13s
build (ubuntu-latest, 1.88)	8m 43s
build (windows-latest, stable)	16m 18s
build (windows-latest, 1.88)	28m 41s
build (macos-latest, 1.88)	13m 2s
	4h 11m 51s