python: remove implicit pip dependency #15

Job	Run time
test (ubuntu-latest, 26.3, false)	36s
test (ubuntu-latest, 27.2, false)	39s
test (ubuntu-latest, 28.2, false)	39s
test (ubuntu-latest, 29.4, false)	49s
test (ubuntu-latest, 30.1, false)	48s
test (macos-latest, 28.2, false)	1m 34s
test (macos-latest, 29.4, false)	2m 27s
test (macos-latest, 30.1, false)	2m 6s
test (windows-latest, 26.3, false)	1m 53s
test (windows-latest, 27.2, false)	3m 15s
test (windows-latest, 28.2, false)	1m 13s
test (windows-latest, 29.4, false)	3m 13s
test (windows-latest, 30.1, false)	1m 6s
test (ubuntu-latest, snapshot, true)	32s
test (macos-latest, snapshot, true)	1m 18s
test (windows-latest, snapshot, true)	3m 11s
	25m 19s

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