Adds support for the basedpyright pyright fork #110

Job	Run time
test (ubuntu-latest, 27.2, false)	46s
test (ubuntu-latest, 28.2, false)	57s
test (ubuntu-latest, 29.4, false)	1m 19s
test (macos-latest, 28.2, false)	1m 25s
test (macos-latest, 29.4, false)	2m 3s
test (windows-latest, 27.2, false)	1m 22s
test (windows-latest, 28.2, false)	2m 44s
test (windows-latest, 29.4, false)	4m 28s
test (ubuntu-latest, snapshot, true)	44s
test (macos-latest, snapshot, true)	1m 22s
test (windows-latest, snapshot, true)	3m 35s
	20m 45s

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