Use `actions/checkout@v4` in `haskell-ci.yml` #80

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Run time

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Job	Run time
Haskell-CI - Linux - ghc-9.10.1	2m 24s
Haskell-CI - Linux - ghc-9.8.2	2m 13s
Haskell-CI - Linux - ghc-9.4.8	2m 4s
Haskell-CI - Linux - ghc-9.2.8	1m 31s
Haskell-CI - Linux - ghc-9.0.2	1m 37s
Haskell-CI - Linux - ghc-8.10.7	1m 33s
	11m 22s