Bump nixpkgs pins #3097

Job	Run time
cabal	10s
cabal-doExactConfig	13s
maintainer-scripts	5s
multi-target	30s
nix-build	1m 0s
runghc	8s
shellFor-hoogle	11s
shellFor-multiple-package	15s
shellFor-not-depends	21s
shellFor-single-package	21s
tests-benchmarks	8s
unit-tests	9s
build-extra-hackages	7s
docs	33s
hix	38s
hydra-ifdLevel-0-and-1	3m 32s
hydra-ifdLevel-2	10m 3s
hydra-ifdLevel-3	30m 15s
plan-extra-hackages	6s
check-materialization-concurrency	19s
check-path-support	6s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	12s
hydra-without-remote-builders-ghc967	1m 27s
update-docs	4s
hydra-without-remote-builders-ghc9102	1m 22s
hix-cabal	8s
nix-tools	1m 45s
	54m 11s

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