Enable Windows tests in GitHub Actions #13

Job	Run time
Test / Windows (5.9 - windows-2022)	22m 34s
Test / Linux (5.8 - jammy)	3m 38s
Test / Windows (6.0 - windows-2022)	13m 40s
Test / Linux (5.9 - jammy)	3m 51s
Test / Windows (nightly - windows-2019)	16m 38s
Test / Linux (5.10 - jammy)	3m 48s
Test / Windows (nightly-6.1 - windows-2019)	17m 0s
Test / Linux (6.0 - jammy)	4m 11s
Test / Linux (nightly-main - jammy)	4m 37s
Test / Linux (nightly-6.1 - jammy)	4m 41s
Soundness / API breakage check	0s
Soundness / Documentation check	0s
Soundness / Broken symlinks check	2s
Soundness / Format check	0s
Soundness / License headers check	0s
Soundness / Python lint check	5s
Soundness / Shell check	45s
Soundness / Unacceptable language check	0s
Soundness / YAML lint check	0s
	1h 35m 30s

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