Add ghc 9.8.3, update nixpkgs and ghc HEAD #2688

Job	Run time
cabal-doExactConfig	9s
nix-build	30s
tests-benchmarks	9s
cabal	12s
maintainer-scripts	7s
multi-target	34s
unit-tests	8s
plan-extra-hackages	5s
runghc	8s
shellFor-hoogle	10s
shellFor-multiple-package	10s
shellFor-not-depends	10s
shellFor-single-package	14s
build-extra-hackages	6s
docs	18s
hix	26s
hydra-ifdLevel-0-and-1	4m 43s
hydra-ifdLevel-2	2m 56s
check-materialization-concurrency	20s
check-path-support	5s
closure-size	7s
haskell-nix-roots-do-not-require-IFDs	7s
hydra-ifdLevel-3	1m 57s
hydra-without-remote-builders-ghc8107	5s
hydra-without-remote-builders-ghc9101	10s
update-docs	4s
hix-cabal	5s
nix-tools	13s
	14m 28s

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