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Git3 Compat + gix speedup for GitPython #3081

Job	Run time
install/import (macos-latest, 3.10)	33s
install/import (ubuntu-latest, 3.9)	17s
install/import (ubuntu-latest, 3.8)	17s
test (ubuntu, 3.11)	4m 51s
install/import (windows-latest, 3.10)	26s
test (windows, 3.13)	43m 5s
install/import (windows-latest, 3.8)	1m 20s
test (ubuntu, 3.14t)	4m 16s
test (windows, 3.15t)	38m 22s
install/import (ubuntu-latest, 3.10)	11s
install/import (windows-latest, 3.9)	1m 10s
test (ubuntu, 3.12, gix)	1m 24s
install/import (macos-latest, 3.8)	1m 35s
test (windows, 3.12, gix)	30m 11s
test (windows, 3.11)	45m 16s
test (ubuntu, 3.15t)	4m 6s
test (macos, 3.14)	12m 36s
test (macos, 3.12, gix)	11m 15s
test (windows, 3.15)	44m 2s
test (ubuntu, 3.13)	5m 27s
install/import (macos-latest, 3.9)	21s
test (ubuntu, 3.12)	1m 37s
test (windows, 3.14)	44m 2s
test (ubuntu, 3.15)	4m 44s
test (macos, 3.12)	12m 52s
test (macos, 3.15)	15m 28s
test (windows, 3.14t)	41m 11s
test (macos, 3.11)	14m 4s
test (windows, 3.12)	43m 59s
test (ubuntu, 3.14)	5m 4s
test (macos, 3.13)	13m 45s
	7h 27m 47s