Exclude `aarch64-dit` from root workspace #733

Job	Run time
build (1.60.0, armv7a-none-eabi)	1m 42s
build (1.60.0, thumbv7em-none-eabi)	1m 45s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 59s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	19s
build (1.60.0, wasm32-unknown-unknown)	1m 42s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 46s
build (stable, armv7a-none-eabi)	11s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	6s
build (stable, thumbv7em-none-eabi)	8s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 55s
build (stable, wasm32-unknown-unknown)	12s
test (x86_64-apple-darwin, macos-latest, stable)	25s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 10s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 1s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 8s
cross (aarch64-unknown-linux-gnu, stable)	32s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 2s
cross (powerpc-unknown-linux-gnu, stable)	32s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	19s
x86 (x86_64-unknown-linux-gnu, stable)	13s
minimal-versions / minimal-versions	48s
	21m 55s

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