Comment out ghc cache for macOS #304

Job	Run time
pre_job / Determine whether to run other jobs	6s
pre_job / Determine whether to run other jobs	5s
static-executable-for-linux / Build static executable for Linux	59s
static-executable-for-linux / Build static executable for Linux	1m 3s
cabal-install / cabal-install (ubuntu-latest)	36s
cabal-install / cabal-install (ubuntu-latest)	41s
cabal-install / cabal-install (macos-latest)	3m 4s
cabal-install / cabal-install (macos-latest)	3m 7s
cabal-install / cabal-install (windows-latest)	2m 36s
cabal-install / cabal-install (windows-latest)	1m 21s
stack / stack (ubuntu-latest)	50s
stack / stack (ubuntu-latest)	54s
stack / stack (macos-latest)	1m 16s
stack / stack (macos-latest)	1m 27s
stack / stack (windows-latest)	4m 45s
stack / stack (windows-latest)	5m 42s
container-image	0s
container-image	0s
release	0s
release	0s
	28m 32s

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