fix build #5

Job	Run time
tests / lint	16s
lint / build (3.9, ubuntu-latest)	18s
lint / build (3.9, windows-latest)	1m 7s
lint / build (3.10, ubuntu-latest)	16s
typecheck / build	20s
lint / build (3.10, macos-latest)	45s
variants / build (3.9, ubuntu-latest)	31s
lint / build (3.10, windows-latest)	1m 17s
variants / build (3.9, macos-latest)	41s
lint / build (3.11, ubuntu-latest)	16s
variants / build (3.9, windows-latest)	3m 35s
lint / build (3.11, macos-latest)	26s
variants / build (3.12, ubuntu-latest)	34s
lint / build (3.11, windows-latest)	57s
variants / build (3.12, macos-latest)	32s
lint / build (3.12, ubuntu-latest)	19s
variants / build (3.12, windows-latest)	3m 30s
lint / build (3.12, macos-latest)	32s
lint / build (3.12, windows-latest)	57s
lint / build (3.13, ubuntu-latest)	17s
lint / build (3.13, macos-latest)	36s
lint / build (3.13, windows-latest)	53s
Build & verify package	0s
Publish in-dev package to test.pypi.org	0s
Publish released package to pypi.org	0s
docs	0s
	18m 55s

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