re-enable linux arm64 builds #3243

Job	Run time
cargo-deny (advisories)	3m 19s
cargo-deny (bans licenses sources)	3m 1s
fmt	13s
rust-analyzer-compat	9m 10s
build-fuzz	1m 58s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu)	7m 12s
build-and-test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 24s
build-and-test (macos-latest, x86_64-apple-darwin)	25m 40s
build-and-test (macos-latest, aarch64-apple-darwin)	18m 28s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	15m 54s
docs	4m 11s
publish-dry-run	0s
complete	1s
	1h 33m 31s

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