Disable aarch64-linux on hydra (#2241) #2482

Job	Run time
unit-tests	13s
cabal	35s
runghc	40s
build-extra-hackages	20s
cabal-doExactConfig	40s
hix	1m 11s
maintainer-scripts	16s
nix-build	53s
multi-target	44s
plan-extra-hackages	14s
shellFor-hoogle	20s
shellFor-multiple-package	24s
shellFor-not-depends	25s
shellFor-single-package	25s
tests-benchmarks	17s
check-materialization-concurrency	21s
check-path-support	11s
closure-size	8s
docs	45s
haskell-nix-roots-do-not-require-IFDs	6s
hix-cabal	10s
hydra-ifdLevel-2	32s
hydra-ifdLevel-0-and-1	47s
hydra-ifdLevel-3-and-ghc-8-10	34s
hydra-ifdLevel-3-and-ghc-9-2	21s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	19s
hydra-without-remote-builders-ghc8107	37s
hydra-without-remote-builders-ghc9101	32s
nix-tools	13s
update-docs	5s
	13m 18s

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