Add ghc 9.8.3, update nixpkgs and ghc HEAD #2719

Job	Run time
cabal	1m 36s
nix-build	2m 20s
runghc	1m 28s
build-extra-hackages	2m 23s
unit-tests	5s
cabal-doExactConfig	9s
maintainer-scripts	12s
plan-extra-hackages	35s
shellFor-hoogle	8s
shellFor-multiple-package	8s
multi-target	11s
shellFor-not-depends	9s
tests-benchmarks	10s
shellFor-single-package	7s
check-materialization-concurrency	19s
check-path-support	1m 58s
closure-size	4s
docs	1m 32s
haskell-nix-roots-do-not-require-IFDs	3m 3s
hix	44s
hydra-ifdLevel-0-and-1	5m 5s
hydra-ifdLevel-2	12m 15s
hydra-ifdLevel-3	30m 14s
update-docs	5s
hix-cabal	1m 23s
hydra-without-remote-builders-ghc8107	28s
hydra-without-remote-builders-ghc9101	30s
nix-tools	11s
	1h 7m 32s

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