Add ghc 9.8.3, update nixpkgs and ghc HEAD #2694

Job	Run time
cabal-doExactConfig	11s
build-extra-hackages	8s
cabal	11s
check-materialization-concurrency	18s
check-path-support	5s
closure-size	3s
docs	21s
hix	15s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	7s
hydra-ifdLevel-0-and-1	3m 48s
hydra-ifdLevel-2	2m 7s
hydra-ifdLevel-3	2m 3s
hydra-without-remote-builders-ghc8107	6s
hydra-without-remote-builders-ghc9101	7s
maintainer-scripts	8s
multi-target	31s
nix-build	31s
plan-extra-hackages	5s
runghc	11s
nix-tools	12s
shellFor-hoogle	8s
shellFor-multiple-package	13s
shellFor-not-depends	11s
shellFor-single-package	14s
tests-benchmarks	7s
unit-tests	8s
update-docs	4s
	12m 41s

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