Work around changes to argparse private API (#673) #576

Job	Run time
bootstrap / setup	5s
pytest / setup	6s
bootstrap / bootstrap (macos-latest, 3.8)	1m 17s
bootstrap / bootstrap (macos-latest, 3.9)	50s
bootstrap / bootstrap (macos-latest, 3.10)	46s
bootstrap / bootstrap (macos-latest, 3.11)	38s
bootstrap / bootstrap (macos-latest, 3.12)	43s
bootstrap / bootstrap (ubuntu-22.04, 3.8)	54s
bootstrap / bootstrap (ubuntu-22.04, 3.9)	54s
bootstrap / bootstrap (ubuntu-22.04, 3.10)	52s
bootstrap / bootstrap (ubuntu-22.04, 3.11)	48s
bootstrap / bootstrap (ubuntu-22.04, 3.12)	57s
bootstrap / bootstrap (windows-latest, 3.8)	1m 50s
bootstrap / bootstrap (windows-latest, 3.9)	1m 34s
bootstrap / bootstrap (windows-latest, 3.10)	1m 28s
bootstrap / bootstrap (windows-latest, 3.11)	1m 35s
bootstrap / bootstrap (windows-latest, 3.12)	1m 44s
bootstrap / bootstrap (ubuntu-20.04, 3.6)	1m 0s
pytest / pytest (macos-latest, 3.8)	1m 21s
pytest / pytest (macos-latest, 3.9)	51s
pytest / pytest (macos-latest, 3.10)	1m 0s
pytest / pytest (macos-latest, 3.11)	47s
pytest / pytest (macos-latest, 3.12)	1m 0s
pytest / pytest (ubuntu-22.04, 3.8)	1m 36s
pytest / pytest (ubuntu-22.04, 3.9)	3m 55s
pytest / pytest (ubuntu-22.04, 3.10)	1m 54s
pytest / pytest (ubuntu-22.04, 3.11)	1m 33s
pytest / pytest (ubuntu-22.04, 3.12)	1m 40s
pytest / pytest (windows-latest, 3.8)	2m 14s
pytest / pytest (windows-latest, 3.9)	2m 4s
pytest / pytest (windows-latest, 3.10)	2m 5s
pytest / pytest (windows-latest, 3.11)	2m 34s
pytest / pytest (windows-latest, 3.12)	2m 4s
pytest / pytest (ubuntu-20.04, 3.6)	1m 4s
	45m 43s

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