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Git3 Compat + gix speedup for GitPython #3089

Job	Run time
install/import (macos-latest, 3.10)	32s
test (ubuntu, 3.15t)	7m 52s
install/import (windows-latest, 3.10)	1m 6s
install/import (macos-latest, 3.8)	1m 2s
install/import (windows-latest, 3.9)	54s
install/import (ubuntu-latest, 3.8)	18s
install/import (windows-latest, 3.8)	44s
install/import (macos-latest, 3.9)	36s
install/import (ubuntu-latest, 3.9)	23s
install/import (ubuntu-latest, 3.10)	10s
test (ubuntu, 3.11)	9m 19s
test (windows, 3.15)	36m 21s
test (windows, 3.11)	56m 58s
test (ubuntu, 3.13)	6m 53s
test (windows, 3.15t)	44m 48s
test (ubuntu, 3.12)	10m 58s
test (windows, 3.12)	1h 10m 54s
test (windows, 3.13)	59m 24s
test (windows, 3.12, gix)	39m 38s
test (macos, 3.14)	12m 22s
test (ubuntu, 3.14t)	8m 33s
test (macos, 3.15)	12m 50s
test (ubuntu, 3.14)	8m 32s
test (windows, 3.14)	46m 8s
test (macos, 3.11)	14m 35s
test (ubuntu, 3.15)	8m 31s
test (windows, 3.14t)	38m 24s
test (ubuntu, 3.12, gix)	7m 48s
test (macos, 3.13)	11m 54s
test (macos, 3.12)	10m 35s
test (macos, 3.12, gix)	8m 30s
	8h 57m 32s