Fix gh-pages update (#2369) #3119

Job	Run time
nix-build	54s
runghc	9s
cabal	13s
cabal-doExactConfig	10s
multi-target	30s
shellFor-hoogle	12s
shellFor-multiple-package	14s
shellFor-not-depends	19s
shellFor-single-package	17s
tests-benchmarks	8s
build-extra-hackages	7s
check-materialization-concurrency	18s
docs	39s
hix	39s
hydra-ifdLevel-0-and-1	1m 49s
hydra-ifdLevel-2	2m 27s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	5s
plan-extra-hackages	9s
unit-tests	9s
update-docs	7s
check-path-support	5s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	17s
hix-cabal	6s
hydra-without-remote-builders-ghc9102	45s
hydra-without-remote-builders-ghc967	53s
nix-tools	15s
	42m 13s

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