Update nixpkgs pins #2045

Job	Run time
cabal-doExactConfig	14m 4s
maintainer-scripts	18s
multi-target	17m 41s
cabal	27m 16s
nix-build	58m 46s
runghc	14m 2s
shellFor-hoogle	17m 39s
shellFor-multiple-package	33m 6s
shellFor-not-depends	45s
unit-tests	8s
tests-benchmarks	10s
shellFor-single-package	30m 27s
build-extra-hackages	1m 21s
check-materialization-concurrency	20s
check-path-support	10s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	6s
docs	34s
hix	6m 40s
hydra-ifdLevel-2	8s
hydra-ifdLevel-0-and-1	21s
hydra-ifdLevel-3-and-ghc-8-10	9s
hydra-ifdLevel-3-and-ghc-9-2	8s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	13s
hydra-without-remote-builders	13s
plan-extra-hackages	10s
update-docs	8s
hix-cabal	8m 12s
nix-tools	15s
	3h 53m 34s

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