CI-windows

CI-unixish.yml: removed `ubuntu-20.04` (#425) #659

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Run time

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Job	Run time
build (windows-2019, Debug)	32s
build (windows-2019, Release)	1m 5s
build (windows-2022, Release)	1m 11s
build (windows-2022, Debug)	1m 27s
	4m 15s