Add GHC 9.12.1 #2833

Job	Run time
nix-build	29s
runghc	9s
cabal-doExactConfig	13s
cabal	9s
unit-tests	4s
build-extra-hackages	7s
check-materialization-concurrency	19s
check-path-support	9s
closure-size	4s
docs	48s
haskell-nix-roots-do-not-require-IFDs	10s
hix	30s
hix-cabal	12s
hydra-ifdLevel-0-and-1	3m 21s
hydra-ifdLevel-2	7m 42s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc8107	2m 12s
hydra-without-remote-builders-ghc9101	2m 1s
maintainer-scripts	8s
multi-target	33s
plan-extra-hackages	5s
nix-tools	11s
shellFor-hoogle	7s
shellFor-multiple-package	12s
shellFor-not-depends	12s
tests-benchmarks	7s
update-docs	4s
shellFor-single-package	17s
	50m 51s

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