Add ghc 9.8.3, update nixpkgs and ghc HEAD #2735

Job	Run time
cabal	1m 30s
cabal-doExactConfig	1m 36s
runghc	10s
multi-target	1m 26s
nix-build	2m 13s
tests-benchmarks	8s
unit-tests	5s
build-extra-hackages	40s
maintainer-scripts	10s
plan-extra-hackages	17s
shellFor-hoogle	10s
shellFor-multiple-package	11s
shellFor-not-depends	11s
shellFor-single-package	10s
check-materialization-concurrency	21s
check-path-support	8s
closure-size	7s
docs	1m 9s
haskell-nix-roots-do-not-require-IFDs	1m 0s
hix	3m 35s
hydra-ifdLevel-0-and-1	6m 25s
hydra-ifdLevel-3	3m 18s
hydra-ifdLevel-2	3m 35s
hydra-without-remote-builders-ghc8107	13s
hydra-without-remote-builders-ghc9101	11s
update-docs	5s
hix-cabal	11s
nix-tools	49s
	30m 4s

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