Update nixpkgs pins #2048

Job	Run time
runghc	2m 53s
cabal-doExactConfig	3m 11s
cabal	3m 12s
tests-benchmarks	2m 54s
unit-tests	1m 13s
build-extra-hackages	2m 57s
docs	2m 57s
maintainer-scripts	44s
hix	9m 5s
multi-target	4m 54s
nix-build	8m 45s
shellFor-hoogle	5m 12s
plan-extra-hackages	12s
shellFor-multiple-package	4m 3s
shellFor-not-depends	1m 11s
shellFor-single-package	3m 55s
check-materialization-concurrency	33s
check-path-support	1m 29s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	22s
hydra-ifdLevel-0-and-1	1m 5s
hix-cabal	6m 4s
hydra-ifdLevel-2	9s
hydra-ifdLevel-3-and-ghc-8-10	13s
hydra-ifdLevel-3-and-ghc-9-2	8s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	8s
hydra-without-remote-builders	51s
nix-tools	1m 48s
update-docs	6s
	1h 10m 18s

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