Add GHC 9.12.1 #2825

Job	Run time
cabal	2m 55s
multi-target	2m 38s
cabal-doExactConfig	2m 50s
nix-build	5m 9s
runghc	2m 47s
shellFor-hoogle	2m 16s
shellFor-multiple-package	2m 20s
shellFor-not-depends	12s
shellFor-single-package	28s
tests-benchmarks	9s
unit-tests	5s
build-extra-hackages	1m 52s
docs	2m 15s
hix	6m 5s
hydra-ifdLevel-2	11m 39s
maintainer-scripts	10s
plan-extra-hackages	8s
check-materialization-concurrency	20s
check-path-support	11s
hix-cabal	2m 59s
haskell-nix-roots-do-not-require-IFDs	1m 5s
closure-size	3s
hydra-ifdLevel-0-and-1	10m 23s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc8107	3m 25s
nix-tools	2m 42s
hydra-without-remote-builders-ghc9101	2m 11s
update-docs	5s
	1h 37m 32s

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