Run aarch64 in CI #178

Job	Run time
Clippy	22s
feature checks	28s
fmt	18s
docs	20s
Fuzz	34s
Outdated	6s
Miri	1m 3s
Test (x86_64-unknown-linux-gnu, nightly)	1m 1s
Test (x86_64-unknown-linux-gnu, beta)	40s
Test (x86_64-unknown-linux-gnu, stable)	46s
Test (x86_64-unknown-linux-gnu, 1.64)	2m 51s
Test (aarch64-unknown-linux-gnu, nightly)	1m 13s
Test (aarch64-unknown-linux-gnu, beta)	1m 4s
Test (aarch64-unknown-linux-gnu, stable)	1m 19s
Test (aarch64-unknown-linux-gnu, 1.64)	3m 25s
	15m 30s

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