Add ghc 9.8.3, update nixpkgs and ghc HEAD #2710

Job	Run time
build-extra-hackages	2m 29s
cabal-doExactConfig	4m 5s
cabal	3m 59s
check-materialization-concurrency	43s
check-path-support	3m 20s
closure-size	6s
docs	2m 42s
haskell-nix-roots-do-not-require-IFDs	3m 15s
hix	5m 30s
hix-cabal	4m 33s
hydra-ifdLevel-0-and-1	5m 2s
hydra-ifdLevel-2	20m 15s
hydra-ifdLevel-3	30m 14s
hydra-without-remote-builders-ghc8107	4m 16s
hydra-without-remote-builders-ghc9101	2m 29s
maintainer-scripts	8s
multi-target	11m 41s
nix-build	34m 1s
nix-tools	23s
plan-extra-hackages	14s
runghc	13s
shellFor-hoogle	24s
shellFor-multiple-package	26s
shellFor-not-depends	32s
shellFor-single-package	26s
tests-benchmarks	12s
update-docs	8s
unit-tests	7s
	2h 21m 53s

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