Add GHC 9.12.2 #2994

Job	Run time
cabal	3m 54s
build-extra-hackages	32s
cabal-doExactConfig	3m 58s
check-materialization-concurrency	19s
check-path-support	4m 14s
closure-size	10s
docs	2m 40s
haskell-nix-roots-do-not-require-IFDs	1m 15s
hix	9m 42s
hix-cabal	11s
hydra-ifdLevel-0-and-1	6m 9s
hydra-ifdLevel-2	11m 39s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc966	53s
hydra-without-remote-builders-ghc9101	3m 18s
maintainer-scripts	9s
multi-target	7m 30s
nix-build	56m 36s
nix-tools	4m 0s
plan-extra-hackages	9s
runghc	11s
shellFor-hoogle	1m 46s
shellFor-multiple-package	1m 41s
shellFor-not-depends	16s
shellFor-single-package	17s
tests-benchmarks	10s
unit-tests	10s
update-docs	4s
	2h 32m 3s

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