Add ghc 9.8.3, update nixpkgs and ghc HEAD #2707

Job	Run time
cabal	12m 28s
nix-build	1h 16m 25s
cabal-doExactConfig	12m 33s
runghc	6m 49s
unit-tests	5s
build-extra-hackages	4m 21s
docs	7m 34s
hix	10m 35s
hydra-ifdLevel-0-and-1	20m 13s
hydra-ifdLevel-2	20m 14s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	41s
plan-extra-hackages	20s
shellFor-hoogle	12s
multi-target	5m 31s
shellFor-multiple-package	20s
shellFor-not-depends	24s
shellFor-single-package	24s
tests-benchmarks	32s
check-materialization-concurrency	21s
check-path-support	17s
closure-size	5s
haskell-nix-roots-do-not-require-IFDs	1m 55s
hix-cabal	14m 27s
hydra-without-remote-builders-ghc8107	1m 15s
hydra-without-remote-builders-ghc9101	47s
nix-tools	44s
update-docs	14s
	3h 49m 56s

Provide feedback