tests

Prevent duplicate test runs on new PRs #963

Job	Run time
style	16s
py-3.8 lib-6.0 ubuntu-latest	5m 13s
package-source	23s
package-wheel (macos-latest, arm64)	21m 43s
py-3.8 lib-5.1 ubuntu-latest	3m 55s
package-wheel (macos-latest, x86_64)	40m 5s
py-3.8 lib-5.0 ubuntu-latest	4m 9s
package-wheel (ubuntu-latest, aarch64)	3h 18m 55s
py-3.8 lib-6.0 windows-latest	3m 8s
package-wheel (ubuntu-latest, i686)	21m 33s
py-3.8 lib-5.1 windows-latest	3m 8s
package-wheel (ubuntu-latest, x86_64)	20m 42s
py-3.8 lib-5.0 windows-latest	3m 26s
package-wheel (windows-latest, AMD64)	16m 23s
py-pypy3.9 lib-5.0 ubuntu-latest	4m 34s
py-3.8 lib-5.0 macos-latest	6m 9s
publish	50s
	5h 54m 32s

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