Update nixpkgs pins (#2250) #2647

Job	Run time
check-materialization-concurrency	21s
build-extra-hackages	7s
cabal-doExactConfig	10s
cabal	14s
check-path-support	5s
closure-size	3s
docs	47s
haskell-nix-roots-do-not-require-IFDs	14s
hix	6m 9s
hix-cabal	7s
hydra-ifdLevel-0-and-1	3m 50s
hydra-ifdLevel-2	3m 57s
hydra-ifdLevel-3	7m 33s
hydra-without-remote-builders-ghc8107	36s
hydra-without-remote-builders-ghc9101	31s
maintainer-scripts	12s
multi-target	35s
nix-build	30s
nix-tools	10s
plan-extra-hackages	7s
runghc	9s
shellFor-hoogle	7s
shellFor-multiple-package	10s
shellFor-not-depends	12s
shellFor-single-package	15s
tests-benchmarks	12s
unit-tests	8s
update-docs	6s
	27m 37s

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