Update nixpkgs pins #2627

Job	Run time
build-extra-hackages	24s
cabal-doExactConfig	1m 28s
check-materialization-concurrency	23s
cabal	1m 25s
check-path-support	8s
closure-size	4s
docs	22s
haskell-nix-roots-do-not-require-IFDs	53m 2s
hix	1h 0m 53s
hix-cabal	5m 48s
hydra-ifdLevel-0-and-1	5m 22s
hydra-ifdLevel-2	20m 10s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc8107	4m 56s
hydra-without-remote-builders-ghc9101	3m 14s
maintainer-scripts	25s
multi-target	16m 17s
nix-build	25m 47s
nix-tools	13s
plan-extra-hackages	7s
runghc	11s
shellFor-hoogle	14s
shellFor-multiple-package	22s
shellFor-not-depends	24s
shellFor-single-package	27s
tests-benchmarks	26s
unit-tests	15s
update-docs	14s
	3h 53m 16s

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