Switch CI eval to `aarch64-darwin` #3386

Job	Run time
nix-build	3m 31s
unit-tests	11s
maintainer-scripts	10s
runghc	14s
shellFor-multiple-package	20s
shellFor-not-depends	23s
shellFor-single-package	31s
shellFor-hoogle	17s
build-extra-hackages	12s
multi-target	43s
tests-benchmarks	14s
cabal	13s
cabal-doExactConfig	18s
plan-extra-hackages	12s
hydra-ifdLevel-3	14m 48s
docs	1m 35s
hydra-without-remote-builders-ghc967	10s
update-docs	8s
haskell-nix-roots-do-not-require-IFDs	20s
hydra-ifdLevel-2	4m 9s
check-path-support	14s
closure-size	7s
check-materialization-concurrency	24s
check-nix-tools	19s
hydra-without-remote-builders-ghc9102	10s
hix-cabal	13s
hix	53s
hydra-ifdLevel-0-and-1	3m 2s
	34m 1s

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