ci

In ci.yml use haskell-actions, update GHC versions #61

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Run time

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Job	Run time
build (ubuntu-latest, latest)	55s
build (ubuntu-latest, 9.6.3)	46s
build (ubuntu-latest, 9.4.8)	2m 25s
build (ubuntu-latest, 9.2.8)	1m 42s
build (windows-latest, latest)	2m 56s
build (windows-latest, 9.6.3)	3m 0s
build (windows-latest, 9.4.8)	1m 27s
build (windows-latest, 9.2.8)	3m 32s
build (macOS-latest, latest)	1m 6s
build (macOS-latest, 9.6.3)	1m 12s
build (macOS-latest, 9.4.8)	1m 1s
build (macOS-latest, 9.2.8)	2m 36s
	22m 38s