Update nixpkgs pins #2587

Job	Run time
cabal	31s
unit-tests	9s
cabal-doExactConfig	26s
nix-build	14m 30s
multi-target	54s
runghc	25s
shellFor-hoogle	51s
shellFor-multiple-package	37s
shellFor-single-package	33s
tests-benchmarks	11s
build-extra-hackages	11s
closure-size	8s
docs	23s
hydra-ifdLevel-0-and-1	11m 50s
hix	49s
hydra-ifdLevel-2	8m 21s
hydra-ifdLevel-3	9m 23s
plan-extra-hackages	9s
maintainer-scripts	6s
shellFor-not-depends	11s
update-docs	4s
check-materialization-concurrency	23s
check-path-support	8s
haskell-nix-roots-do-not-require-IFDs	4s
hix-cabal	17s
hydra-without-remote-builders-ghc8107	7s
hydra-without-remote-builders-ghc9101	9s
nix-tools	10s
	52m 0s

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