fix: fix py37 (#243) #463

Job	Run time
test magicgui	1m 22s
benchmarks	2m 15s
Check Manifest	29s
typing	20s
py3.7 on ubuntu-latest	1m 33s
py3.7 on macos-latest	2m 22s
py3.7 on windows-latest	3m 6s
py3.8 on ubuntu-latest	2m 23s
py3.8 on macos-latest	2m 8s
py3.8 on windows-latest	2m 52s
py3.9 on ubuntu-latest	2m 7s
py3.9 on macos-latest	1m 56s
py3.9 on windows-latest	3m 38s
py3.10 on ubuntu-latest	2m 12s
py3.10 on macos-latest	2m 26s
py3.10 on windows-latest	3m 2s
py3.11 on ubuntu-latest pydantic<2	1m 41s
py3.11 on macos-latest	2m 32s
py3.11 on windows-latest pydantic<2	3m 8s
py3.10 on ubuntu-latest PyQt5	1m 44s
py3.10 on macos-latest PyQt6	2m 6s
py3.10 on ubuntu-latest PySide2	2m 39s
py3.10 on macos-latest PySide6	2m 23s
py3.12-dev on ubuntu-latest	1m 47s
	52m 11s

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