Update nixpkgs pins #2047

Job	Run time
cabal	12s
cabal-doExactConfig	13s
nix-build	3m 50s
tests-benchmarks	20s
runghc	17s
unit-tests	4s
build-extra-hackages	6s
hix	1m 0s
maintainer-scripts	9s
multi-target	9s
plan-extra-hackages	5s
shellFor-hoogle	13s
shellFor-multiple-package	9s
shellFor-not-depends	22s
shellFor-single-package	29s
check-materialization-concurrency	19s
check-path-support	8s
closure-size	3s
docs	32s
haskell-nix-roots-do-not-require-IFDs	6s
hix-cabal	5m 9s
hydra-ifdLevel-0-and-1	17s
hydra-ifdLevel-2	12s
hydra-ifdLevel-3-and-ghc-9-2	11s
hydra-ifdLevel-3-and-ghc-8-10	14s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	9s
hydra-without-remote-builders	22s
update-docs	6s
nix-tools	15s
	15m 41s

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