Update nixpkgs pins #2589

Job	Run time
unit-tests	5s
cabal	22s
multi-target	48s
cabal-doExactConfig	24s
nix-build	32s
runghc	28s
tests-benchmarks	28s
check-materialization-concurrency	23s
check-path-support	6s
build-extra-hackages	10s
closure-size	7s
docs	28s
hix	3m 40s
hydra-ifdLevel-0-and-1	2m 19s
hydra-ifdLevel-2	2m 33s
hydra-ifdLevel-3	30m 18s
maintainer-scripts	8s
plan-extra-hackages	14s
shellFor-hoogle	7s
shellFor-multiple-package	11s
shellFor-not-depends	10s
shellFor-single-package	12s
update-docs	4s
haskell-nix-roots-do-not-require-IFDs	6s
hix-cabal	6s
hydra-without-remote-builders-ghc8107	1m 46s
hydra-without-remote-builders-ghc9101	1m 31s
nix-tools	8s
	47m 54s

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