Exclude `aarch64-dit` from root workspace #732

Job	Run time
build (1.60.0, armv7a-none-eabi)	1m 45s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 4s
build (1.60.0, thumbv7em-none-eabi)	1m 38s
cross (aarch64-unknown-linux-gnu, stable)	39s
build (1.60.0, wasm32-unknown-unknown)	1m 41s
build (stable, armv7a-none-eabi)	12s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 0s
build (stable, thumbv7em-none-eabi)	21s
cross (powerpc-unknown-linux-gnu, stable)	30s
build (stable, wasm32-unknown-unknown)	9s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 2s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	21s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	32s
x86 (x86_64-unknown-linux-gnu, stable)	23s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 38s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	10s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 42s
test (x86_64-apple-darwin, macos-latest, stable)	22s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 8s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 42s
minimal-versions / minimal-versions	49s
	22m 48s

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