GitHub Actions: Use system GHC #460

Job	Run time
build (9.4.5, ubuntu-latest, stack-ghc-9.4.yaml, --haddock --no-haddock-deps, --flag toysolver:Bu...	7m 47s
build (9.2.8, ubuntu-latest, stack-ghc-9.2.yaml, --haddock --no-haddock-deps, --flag toysolver:Bu...	6m 30s
build (9.0.2, ubuntu-latest, stack-ghc-9.0.yaml, --haddock --no-haddock-deps, --flag toysolver:Bu...	6m 58s
build (9.0.2, macos-13, stack-ghc-9.0.yaml, --flag toysolver:BuildToyFMF --flag toysolver:BuildSa...	9m 8s
build (8.10.7, windows-latest, stack-ghc-8.10.yaml, --flag toysolver:BuildToyFMF --flag toysolver...	15m 33s
build (8.8.4, ubuntu-latest, stack-ghc-8.8.yaml, --coverage, --flag toysolver:BuildToyFMF --flag ...	8m 4s
build (8.6.3, windows-latest, stack-windows-i386.yaml, --flag toysolver:BuildToyFMF --flag toysol...	19m 19s
github-release	0s
	1h 13m 19s

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