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Rename `aarch64-dit` to `dit` #1870

Job	Run time
cross (aarch64-unknown-linux-gnu, 1.85.0)	55s
windows (x86_64-pc-windows-gnu, 1.85.0)	28s
minimal-versions / minimal-versions	1m 35s
macos (1.85.0)	25s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 35s
build-only	1m 34s
linux (x86_64-unknown-linux-gnu, stable)	1m 34s
cross (aarch64-unknown-linux-gnu, stable)	1m 34s
macos (stable)	23s
linux (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	51s
linux (x86_64-unknown-linux-gnu, 1.85.0)	1m 34s
windows (x86_64-pc-windows-gnu, stable)	37s
	13m 5s