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Git3 Compat + gix speedup for GitPython #3057

Job	Run time
install/import (macos-latest, 3.9)	34s
install/import (ubuntu-latest, 3.10)	8s
install/import (ubuntu-latest, 3.8)	19s
install/import (macos-latest, 3.8)	48s
install/import (windows-latest, 3.9)	1m 6s
install/import (macos-latest, 3.10)	34s
install/import (windows-latest, 3.10)	26s
test (ubuntu, 3.14)	4m 9s
install/import (windows-latest, 3.8)	1m 2s
install/import (ubuntu-latest, 3.9)	15s
test (macos, 3.12)	10m 40s
test (windows, 3.11)	48m 59s
test (macos, 3.15)	14m 52s
test (ubuntu, 3.11)	4m 46s
test (ubuntu, 3.15t)	3m 41s
test (macos, 3.13)	12m 31s
test (ubuntu, 3.15)	4m 9s
test (macos, 3.14)	11m 12s
test (ubuntu, 3.14t)	3m 48s
test (windows, 3.13)	47m 35s
test (windows, 3.12)	41m 20s
test (macos, 3.11)	10m 29s
test (windows, 3.14t)	39m 13s
test (ubuntu, 3.13)	3m 31s
test (ubuntu, 3.12)	5m 2s
test (windows, 3.15t)	38m 4s
test (ubuntu, 3.12, gix)	4m 35s
test (macos, 3.12, gix)	9m 22s
test (windows, 3.15)	41m 56s
test (windows, 3.12, gix)	33m 45s
test (windows, 3.14)	39m 32s
	7h 18m 23s