python: remove implicit pip dependency #17

Job	Run time
test (ubuntu-latest, 26.3, false)	36s
test (ubuntu-latest, 27.2, false)	40s
test (ubuntu-latest, 28.2, false)	36s
test (ubuntu-latest, 29.4, false)	58s
test (ubuntu-latest, 30.1, false)	54s
test (macos-latest, 28.2, false)	1m 34s
test (macos-latest, 29.4, false)	2m 15s
test (macos-latest, 30.1, false)	1m 50s
test (windows-latest, 26.3, false)	4m 46s
test (windows-latest, 27.2, false)	1m 38s
test (windows-latest, 28.2, false)	2m 26s
test (windows-latest, 29.4, false)	3m 39s
test (windows-latest, 30.1, false)	3m 19s
test (ubuntu-latest, snapshot, true)	33s
test (macos-latest, snapshot, true)	1m 49s
test (windows-latest, snapshot, true)	1m 19s
	28m 52s

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