Python CI/CD tests

add `url_is_alive()` from stewi #84

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Run time

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Job	Run time
build (ubuntu-latest, 3.7)	45s
build (ubuntu-latest, 3.8)	58s
build (ubuntu-latest, 3.9)	53s
build (ubuntu-latest, 3.10)	57s
build (ubuntu-latest, 3.11)	48s
build (windows-latest, 3.7)	3m 3s
build (windows-latest, 3.8)	4m 38s
build (windows-latest, 3.9)	1m 50s
build (windows-latest, 3.10)	1m 30s
build (windows-latest, 3.11)	1m 35s
build (macos-latest, 3.7)	1m 11s
build (macos-latest, 3.8)	1m 23s
build (macos-latest, 3.9)	1m 27s
build (macos-latest, 3.10)	1m 36s
build (macos-latest, 3.11)	1m 17s
	23m 51s