Bump nixpkgs pins #3095

Job	Run time
cabal-doExactConfig	11s
cabal	11s
nix-build	1m 5s
runghc	9s
unit-tests	5s
build-extra-hackages	11s
docs	34s
hix	34s
hydra-ifdLevel-0-and-1	2m 31s
hydra-ifdLevel-2	20m 15s
maintainer-scripts	5s
plan-extra-hackages	10s
multi-target	30s
shellFor-hoogle	12s
shellFor-multiple-package	15s
shellFor-not-depends	21s
shellFor-single-package	18s
tests-benchmarks	12s
check-materialization-concurrency	19s
check-path-support	18s
closure-size	2s
haskell-nix-roots-do-not-require-IFDs	21s
hix-cabal	1m 9s
hydra-ifdLevel-3	30m 11s
hydra-without-remote-builders-ghc9102	1m 26s
hydra-without-remote-builders-ghc967	11s
nix-tools	35s
update-docs	4s
	1h 2m 25s

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