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Git3 Compat + gix speedup for GitPython #3035

Job	Run time
install/import (ubuntu-latest, 3.8)	16s
install/import (macos-latest, 3.8)	1m 4s
install/import (macos-latest, 3.9)	34s
test (windows, 3.15t)	49m 15s
install/import (macos-latest, 3.10)	35s
install/import (ubuntu-latest, 3.10)	9s
test (windows, 3.11)	56m 42s
install/import (ubuntu-latest, 3.9)	17s
install/import (windows-latest, 3.8)	1m 6s
test (windows, 3.12, gix)	37m 44s
test (ubuntu, 3.12, gix)	4m 28s
test (ubuntu, 3.15t)	4m 6s
install/import (windows-latest, 3.10)	24s
test (ubuntu, 3.11)	4m 56s
install/import (windows-latest, 3.9)	1m 5s
test (macos, 3.14)	12m 58s
test (macos, 3.12)	14m 52s
test (macos, 3.15)	9m 48s
test (macos, 3.11)	14m 49s
test (macos, 3.12, gix)	10m 11s
test (ubuntu, 3.13)	4m 1s
test (windows, 3.12)	53m 51s
test (windows, 3.14t)	46m 31s
test (ubuntu, 3.12)	4m 43s
test (windows, 3.14)	47m 0s
test (windows, 3.13)	49m 44s
test (macos, 3.13)	13m 43s
test (ubuntu, 3.14)	4m 3s
test (windows, 3.15)	47m 23s
test (ubuntu, 3.14t)	4m 12s
test (ubuntu, 3.15)	4m 29s
	8h 24m 59s