Add GHC 9.12.1 #2832

Job	Run time
unit-tests	6s
maintainer-scripts	1m 23s
cabal-doExactConfig	4m 3s
cabal	4m 1s
multi-target	4m 40s
nix-build	7m 18s
runghc	3m 24s
shellFor-hoogle	4m 23s
shellFor-multiple-package	2m 22s
shellFor-not-depends	2m 33s
shellFor-single-package	3m 15s
tests-benchmarks	12s
build-extra-hackages	33s
check-materialization-concurrency	23s
check-path-support	1m 26s
closure-size	3s
haskell-nix-roots-do-not-require-IFDs	1m 12s
docs	1m 34s
hix	2m 37s
hix-cabal	10s
hydra-ifdLevel-0-and-1	4m 22s
hydra-ifdLevel-2	1m 49s
hydra-ifdLevel-3	1m 27s
hydra-without-remote-builders-ghc8107	10s
hydra-without-remote-builders-ghc9101	7s
nix-tools	14s
plan-extra-hackages	9s
update-docs	4s
	54m 0s

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