Add ghc 9.8.3, update nixpkgs and ghc HEAD #2720

Job	Run time
build-extra-hackages	7s
cabal	46s
cabal-doExactConfig	43s
check-materialization-concurrency	20s
check-path-support	5s
closure-size	4s
docs	20s
haskell-nix-roots-do-not-require-IFDs	9s
hix	32s
hix-cabal	4m 5s
hydra-ifdLevel-0-and-1	2m 44s
hydra-ifdLevel-2	3m 39s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	21s
hydra-without-remote-builders-ghc9101	22s
maintainer-scripts	11s
multi-target	11s
nix-build	9s
nix-tools	11s
plan-extra-hackages	5s
runghc	7s
shellFor-hoogle	7s
shellFor-multiple-package	6s
shellFor-not-depends	6s
shellFor-single-package	7s
tests-benchmarks	7s
update-docs	8s
unit-tests	5s
	46m 7s

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