Add ghc 9.8.3, update nixpkgs and ghc HEAD #2691

Job	Run time
check-path-support	4m 23s
cabal-doExactConfig	4m 27s
build-extra-hackages	2m 32s
cabal	4m 23s
closure-size	8s
docs	2m 3s
haskell-nix-roots-do-not-require-IFDs	2m 19s
hix	3m 41s
hydra-ifdLevel-0-and-1	13m 49s
hix-cabal	3m 39s
hydra-ifdLevel-2	5m 13s
hydra-ifdLevel-3	4m 3s
hydra-without-remote-builders-ghc8107	8s
hydra-without-remote-builders-ghc9101	6s
maintainer-scripts	7s
multi-target	20m 49s
nix-build	51m 44s
nix-tools	30s
runghc	21s
plan-extra-hackages	14s
shellFor-hoogle	15m 32s
shellFor-multiple-package	10m 45s
shellFor-not-depends	23s
shellFor-single-package	26s
unit-tests	13s
tests-benchmarks	18s
update-docs	6s
check-materialization-concurrency	25s
	2h 32m 47s

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