tests

Fix mypy errors in tests #1221

Job	Run time
style	16s
py-3.9 lib-6.1 ubuntu-latest	5m 28s
py-3.9 lib-6.0 ubuntu-latest	4m 24s
py-3.9 lib-6.1 windows-latest	3m 17s
package-source	22s
py-3.9 lib-5.1 ubuntu-latest	4m 5s
py-3.9 lib-6.0 windows-latest	3m 20s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 32s
py-3.9 lib-5.1 windows-latest	3m 0s
package-wheel (macos-latest, arm64)	12m 16s
py-3.9 lib-6.1 macos-latest	5m 43s
package-wheel (macos-latest, x86_64)	37m 25s
package-wheel (ubuntu-latest, aarch64)	2h 40m 26s
package-wheel (ubuntu-latest, i686)	17m 16s
package-wheel (ubuntu-latest, x86_64)	16m 54s
package-wheel (windows-latest, AMD64)	14m 7s
publish	35s
	4h 53m 26s

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