Add ghc 9.8.3, update nixpkgs and ghc HEAD #2708

Job	Run time
cabal	33s
cabal-doExactConfig	35s
multi-target	1m 13s
runghc	20s
unit-tests	17s
tests-benchmarks	27s
nix-build	23m 25s
shellFor-hoogle	37s
shellFor-single-package	41s
shellFor-multiple-package	39s
build-extra-hackages	26s
hix	58s
docs	52s
maintainer-scripts	15s
plan-extra-hackages	8s
shellFor-not-depends	21s
check-materialization-concurrency	26s
check-path-support	19s
closure-size	8s
haskell-nix-roots-do-not-require-IFDs	25s
hydra-ifdLevel-0-and-1	5m 44s
hydra-ifdLevel-2	10m 31s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	3m 30s
hydra-without-remote-builders-ghc9101	3m 22s
update-docs	4s
hix-cabal	8s
nix-tools	14s
	1h 26m 48s

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