Update nixpkgs pins #2598

Job	Run time
runghc	27s
nix-build	1m 32s
cabal	28s
unit-tests	4s
cabal-doExactConfig	27s
maintainer-scripts	7s
multi-target	5m 20s
shellFor-hoogle	5m 5s
shellFor-multiple-package	4m 56s
shellFor-not-depends	12s
shellFor-single-package	2m 48s
tests-benchmarks	26s
build-extra-hackages	6s
check-materialization-concurrency	22s
check-path-support	7s
closure-size	6s
docs	21s
haskell-nix-roots-do-not-require-IFDs	5s
hix	2m 57s
hydra-ifdLevel-0-and-1	2m 39s
hydra-ifdLevel-2	5m 11s
hydra-ifdLevel-3	30m 10s
plan-extra-hackages	6s
update-docs	8s
hix-cabal	14s
hydra-without-remote-builders-ghc8107	57s
hydra-without-remote-builders-ghc9101	57s
nix-tools	13s
	1h 6m 31s

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