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Git3 Compat + gix speedup for GitPython #3049

Job	Run time
install/import (ubuntu-latest, 3.8)	15s
install/import (windows-latest, 3.10)	21s
install/import (windows-latest, 3.8)	59s
test (macos, 3.15)	12m 20s
install/import (ubuntu-latest, 3.9)	13s
install/import (macos-latest, 3.10)	33s
install/import (macos-latest, 3.8)	1m 4s
test (macos, 3.14)	12m 6s
install/import (ubuntu-latest, 3.10)	9s
install/import (windows-latest, 3.9)	1m 9s
test (ubuntu, 3.15)	4m 26s
install/import (macos-latest, 3.9)	35s
test (ubuntu, 3.14)	4m 12s
test (ubuntu, 3.14t)	4m 21s
test (macos, 3.12, gix)	10m 4s
test (ubuntu, 3.15t)	4m 8s
test (macos, 3.11)	13m 0s
test (windows, 3.15)	40m 6s
test (macos, 3.13)	11m 33s
test (windows, 3.15t)	37m 4s
test (windows, 3.12)	53m 39s
test (windows, 3.13)	55m 8s
test (windows, 3.14)	51m 35s
test (ubuntu, 3.13)	3m 29s
test (windows, 3.11)	47m 0s
test (windows, 3.12, gix)	31m 22s
test (macos, 3.12)	14m 54s
test (ubuntu, 3.12, gix)	4m 34s
test (ubuntu, 3.12)	5m 13s
test (windows, 3.14t)	39m 9s
test (ubuntu, 3.11)	4m 46s
	7h 49m 27s