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Rename `aarch64-dit` to `dit` #1872

Job	Run time
windows (x86_64-pc-windows-gnu, 1.85.0)	34s
build-only	19s
macos (stable)	26s
cross (aarch64-unknown-linux-gnu, 1.85.0)	35s
minimal-versions / minimal-versions	19s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 7s
linux (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	32s
windows (x86_64-pc-windows-gnu, stable)	41s
macos (1.85.0)	26s
cross (aarch64-unknown-linux-gnu, stable)	43s
linux (x86_64-unknown-linux-gnu, stable)	24s
linux (x86_64-unknown-linux-gnu, 1.85.0)	14s
	6m 20s