Add GHC 9.12.1 #2848

Job	Run time
build-extra-hackages	7s
cabal	12s
cabal-doExactConfig	11s
check-materialization-concurrency	19s
check-path-support	9s
closure-size	4s
docs	19s
hix	49s
hydra-ifdLevel-0-and-1	3m 34s
hydra-ifdLevel-2	16m 8s
hydra-ifdLevel-3	30m 10s
maintainer-scripts	8s
multi-target	54s
nix-build	16m 9s
plan-extra-hackages	5s
runghc	7s
shellFor-hoogle	12s
shellFor-multiple-package	14s
shellFor-not-depends	12s
shellFor-single-package	16s
tests-benchmarks	9s
unit-tests	5s
update-docs	4s
haskell-nix-roots-do-not-require-IFDs	13s
hix-cabal	11s
hydra-without-remote-builders-ghc8107	1m 36s
hydra-without-remote-builders-ghc9101	1m 54s
nix-tools	11s
	1h 14m 42s

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