Update nixpkgs pins #2036

Job	Run time
cabal-doExactConfig	8m 43s
build-extra-hackages	10m 23s
cabal	8m 51s
docs	30s
hix	1h 13m 55s
maintainer-scripts	16s
multi-target	1h 8m 37s
nix-build	1h 17m 19s
plan-extra-hackages	10s
runghc	42m 34s
shellFor-hoogle	1h 8m 27s
shellFor-multiple-package	1h 7m 35s
shellFor-not-depends	13s
tests-benchmarks	20s
shellFor-single-package	48m 46s
unit-tests	9s
check-materialization-concurrency	37s
check-path-support	2m 12s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	17m 47s
hix-cabal	38m 2s
hydra-ifdLevel-0-and-1	13s
hydra-ifdLevel-2	11s
hydra-ifdLevel-3-and-ghc-8-10	8s
hydra-ifdLevel-3-and-ghc-9-2	13s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	10s
hydra-without-remote-builders	21s
nix-tools	16s
update-docs	5s
	8h 57m 7s

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