add apple silicon support (aarch64-apple-darwin) #85

Job	Run time
cargo-deny	21s
Clippy & fmt	3m 24s
build (windows-latest, x86_64-pc-windows-msvc)	4m 16s
Unused dependency check	46s
build (macos-latest, x86_64-apple-darwin)	55s
Install test (Linux)	1m 2s
Install test (macOS)	58s
build (macos-latest, aarch64-apple-darwin)	1m 3s
Install test (Windows)	2m 34s
build (ubuntu-latest, x86_64-unknown-linux-musl)	54s
Test (ubuntu-latest)	30s
Test Publish	53s
Test (windows-latest)	3m 28s
Test (macOS-latest)	26s
	21m 30s

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