Bump nixpkgs pins #3096

Job	Run time
cabal	35s
nix-build	3m 16s
cabal-doExactConfig	39s
runghc	21s
multi-target	45s
shellFor-hoogle	30s
shellFor-multiple-package	44s
shellFor-single-package	17s
shellFor-not-depends	31s
tests-benchmarks	8s
unit-tests	5s
build-extra-hackages	7s
closure-size	2s
docs	28s
hix	2m 19s
hydra-ifdLevel-0-and-1	2m 40s
hydra-ifdLevel-2	9m 54s
maintainer-scripts	8s
plan-extra-hackages	9s
hydra-ifdLevel-3	30m 10s
check-materialization-concurrency	21s
check-path-support	8s
haskell-nix-roots-do-not-require-IFDs	9s
hydra-without-remote-builders-ghc9102	11s
hydra-without-remote-builders-ghc967	1m 16s
nix-tools	11s
update-docs	4s
hix-cabal	7s
	56m 15s

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