Disable speculative evaluation in coreprep in ghc 9.4, 9.6, 9.8 #2652

Job	Run time
unit-tests	4s
nix-build	26s
cabal	10s
cabal-doExactConfig	12s
multi-target	28s
runghc	8s
shellFor-hoogle	7s
shellFor-multiple-package	10s
shellFor-single-package	14s
tests-benchmarks	7s
build-extra-hackages	6s
check-materialization-concurrency	23s
check-path-support	5s
closure-size	7s
docs	17s
haskell-nix-roots-do-not-require-IFDs	11s
hix	28s
hix-cabal	14s
hydra-ifdLevel-0-and-1	2m 21s
hydra-ifdLevel-2	4m 54s
hydra-ifdLevel-3	30m 9s
hydra-without-remote-builders-ghc8107	32s
hydra-without-remote-builders-ghc9101	2m 11s
maintainer-scripts	7s
nix-tools	9s
plan-extra-hackages	6s
shellFor-not-depends	11s
update-docs	3s
	44m 40s

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