Update nixpkgs pins #2578

Job	Run time
cabal	18m 31s
build-extra-hackages	9m 23s
cabal-doExactConfig	13m 22s
check-materialization-concurrency	24s
check-path-support	6m 52s
docs	15m 14s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	14m 24s
hix	14m 42s
hix-cabal	46m 40s
hydra-ifdLevel-0-and-1	15m 28s
hydra-ifdLevel-2	29s
hydra-ifdLevel-3	31s
hydra-without-remote-builders-ghc8107	8s
hydra-without-remote-builders-ghc9101	4s
maintainer-scripts	7s
multi-target	44s
nix-build	16m 9s
nix-tools	11s
plan-extra-hackages	17s
runghc	18s
shellFor-hoogle	1m 49s
shellFor-multiple-package	15s
shellFor-single-package	16s
shellFor-not-depends	16s
tests-benchmarks	10s
unit-tests	5s
update-docs	8s
	2h 57m 0s

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