Resolve #665: ghc-head works with GHA #506

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Run time

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Job	Run time
Haskell-CI - Linux - ghc-9.4.5	4m 47s
Haskell-CI - Linux - ghc-9.2.7	5m 47s
Haskell-CI - Linux - ghc-9.0.2	5m 56s
Haskell-CI - Linux - ghc-8.10.7	5m 24s
Haskell-CI - Linux - ghc-8.8.4	5m 30s
Haskell-CI - Linux - ghc-8.6.5	5m 35s
Haskell-CI - Linux - ghc-8.4.4	6m 9s
Haskell-CI - Linux - ghc-8.2.2	6m 3s
Haskell-CI - Linux - ghc-head	3m 3s
	48m 14s