Fix tests that break with latest random package and ghc 9.12.1 #2855

Job	Run time
cabal	3m 21s
cabal-doExactConfig	2m 39s
check-materialization-concurrency	20s
build-extra-hackages	2m 18s
closure-size	8s
check-path-support	2m 20s
docs	4m 29s
haskell-nix-roots-do-not-require-IFDs	2m 42s
hix	5m 32s
hix-cabal	2m 31s
hydra-ifdLevel-0-and-1	5m 43s
hydra-ifdLevel-2	13m 34s
hydra-ifdLevel-3	30m 11s
hydra-without-remote-builders-ghc8107	3m 39s
hydra-without-remote-builders-ghc9101	3m 26s
maintainer-scripts	9s
multi-target	3m 28s
nix-build	2m 35s
nix-tools	14s
plan-extra-hackages	8s
runghc	7s
shellFor-hoogle	3m 21s
shellFor-multiple-package	36s
shellFor-not-depends	15s
shellFor-single-package	21s
tests-benchmarks	9s
unit-tests	5s
update-docs	6s
	1h 34m 27s

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