re-enable linux arm64 builds #3284

Job	Run time
build-fuzz	55s
cargo-deny (advisories)	3m 27s
cargo-deny (bans licenses sources)	3m 25s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 51s
build-and-test (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 35s
build-and-test (macos-latest, x86_64-apple-darwin)	27m 39s
build-and-test (macos-latest, aarch64-apple-darwin)	14m 14s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	19m 1s
docs	4m 13s
fmt	21s
publish-dry-run	0s
rust-analyzer-compat	11m 53s
complete	1s
	1h 34m 35s

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