Add ghc 9.8.3, update nixpkgs and ghc HEAD #2722

Job	Run time
multi-target	9s
nix-build	9s
cabal-doExactConfig	8s
cabal	9s
runghc	7s
tests-benchmarks	12s
unit-tests	4s
build-extra-hackages	5s
check-materialization-concurrency	20s
check-path-support	5s
closure-size	3s
docs	25s
haskell-nix-roots-do-not-require-IFDs	9s
hix	18s
hydra-ifdLevel-0-and-1	2m 38s
hydra-ifdLevel-2	2m 40s
hydra-ifdLevel-3	30m 9s
maintainer-scripts	10s
plan-extra-hackages	5s
shellFor-hoogle	8s
shellFor-multiple-package	7s
shellFor-not-depends	7s
shellFor-single-package	7s
update-docs	4s
hix-cabal	5s
hydra-without-remote-builders-ghc8107	9s
hydra-without-remote-builders-ghc9101	10s
nix-tools	10s
	39m 12s

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