Use gitoxide in get_diff #9328

Job	Run time
build-linux-musl (stable)	6m 45s
build-linux-musl (nightly)	7m 24s
build-linux-musl (1.81)	3m 34s
build (macos-latest, 1.81)	1m 15s
build (ubuntu-latest, stable)	3m 9s
build (ubuntu-latest, nightly)	3m 7s
build (macos-latest, nightly)	2m 29s
build-linux-arm (stable)	19m 11s
build (windows-latest, 1.81)	2m 25s
build (windows-latest, stable)	10m 42s
build (macos-latest, stable)	2m 36s
Changelog Test	6s
build-linux-arm (1.81)	6m 22s
build-linux-arm (nightly)	18m 28s
build-apple-x86 (1.81)	1m 44s
build (windows-latest, nightly)	10m 42s
build-apple-x86 (nightly)	6m 3s
build (ubuntu-latest, 1.81)	49s
udeps	2m 21s
Lints	42s
Test Homebrew Formula (macOS)	4m 29s
build-apple-x86 (stable)	6m 52s
	2h 1m 15s

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