Add ghc 9.6.7 #3033

Job	Run time
build-extra-hackages	1m 9s
cabal-doExactConfig	33s
cabal	1m 6s
check-materialization-concurrency	20s
check-path-support	3m 3s
closure-size	3s
docs	12m 21s
haskell-nix-roots-do-not-require-IFDs	1m 8s
hix	7m 46s
hix-cabal	51s
hydra-ifdLevel-0-and-1	4m 53s
hydra-ifdLevel-2	7m 42s
hydra-ifdLevel-3	30m 16s
hydra-without-remote-builders-ghc9101	8s
hydra-without-remote-builders-ghc966	7s
maintainer-scripts	8s
multi-target	49s
nix-build	37s
nix-tools	41s
runghc	11s
plan-extra-hackages	11s
shellFor-hoogle	17s
shellFor-multiple-package	13s
shellFor-not-depends	1m 14s
shellFor-single-package	14s
tests-benchmarks	10s
unit-tests	8s
update-docs	5s
	1h 16m 24s

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