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Update CI to latest GHC and action versions, modernize caching #887

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Run time

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Job	Run time
ubuntu-latest / ghc 9.10.3	1m 48s
ubuntu-latest / ghc 9.12.2	1m 50s
ubuntu-latest / ghc 9.8.4	3m 7s
ubuntu-latest / ghc 9.6.7	2m 59s
	9m 44s