tests

Prevent duplicate test runs on new PRs #962

Job	Run time
package-source	20s
package-wheel (macos-latest, arm64)	17m 7s
py-3.8 lib-6.0 ubuntu-latest	5m 3s
package-wheel (macos-latest, x86_64)	34m 33s
style	16s
py-3.8 lib-5.1 ubuntu-latest	3m 57s
package-wheel (ubuntu-latest, aarch64)	3h 20m 15s
py-3.8 lib-5.0 ubuntu-latest	4m 7s
package-wheel (ubuntu-latest, i686)	21m 17s
py-pypy3.9 lib-5.0 ubuntu-latest	4m 26s
package-wheel (ubuntu-latest, x86_64)	20m 29s
py-3.8 lib-6.0 windows-latest	3m 18s
py-3.8 lib-5.0 macos-latest	8m 45s
package-wheel (windows-latest, AMD64)	15m 8s
py-3.8 lib-5.1 windows-latest	3m 11s
py-3.8 lib-5.0 windows-latest	2m 50s
publish	43s
	5h 45m 45s

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