Update nixpkgs pins #2643

Job	Run time
cabal	2m 12s
build-extra-hackages	2m 10s
cabal-doExactConfig	53s
maintainer-scripts	1m 12s
multi-target	2m 31s
nix-build	2m 26s
plan-extra-hackages	6s
runghc	7s
shellFor-multiple-package	10s
shellFor-hoogle	12s
shellFor-not-depends	11s
shellFor-single-package	14s
tests-benchmarks	6s
unit-tests	4s
check-materialization-concurrency	22s
check-path-support	16s
closure-size	3s
docs	1m 5s
haskell-nix-roots-do-not-require-IFDs	55s
hix	40s
hix-cabal	11s
hydra-ifdLevel-0-and-1	2m 18s
hydra-ifdLevel-2	6m 40s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	3m 6s
hydra-without-remote-builders-ghc9101	2m 51s
nix-tools	9s
update-docs	5s
	1h 1m 25s

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