Add ghc 9.6.5 #2128

Job	Run time
unit-tests	7s
nix-build	25s
cabal	10s
cabal-doExactConfig	10s
multi-target	12s
shellFor-hoogle	11s
shellFor-multiple-package	13s
shellFor-not-depends	13s
shellFor-single-package	17s
tests-benchmarks	10s
build-extra-hackages	9s
check-materialization-concurrency	21s
closure-size	7s
check-path-support	9s
docs	1m 4s
hix	25s
haskell-nix-roots-do-not-require-IFDs	8s
hydra-ifdLevel-0-and-1	14s
hydra-ifdLevel-2	11s
hydra-ifdLevel-3-and-ghc-8-10	11s
hydra-ifdLevel-3-and-ghc-9-2	11s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	9s
maintainer-scripts	9s
plan-extra-hackages	8s
runghc	9s
update-docs	6s
hix-cabal	1m 15s
hydra-without-remote-builders	31s
nix-tools	24s
	8m 9s

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