md5: add LoongArch64 CI job, minor code tweaks, bump to v0.10.6 #939

Job	Run time
test-msrv	4m 13s
minimal-versions / minimal-versions	3m 4s
set-msrv / set-msrv	5s
macos (1.59.0)	4m 23s
macos (stable)	1m 26s
build (1.59, thumbv7em-none-eabi)	3m 29s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	6m 47s
build (1.59, wasm32-unknown-unknown)	3m 31s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 5s
windows (1.59.0, x86_64-pc-windows-gnu)	5m 44s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	4m 53s
linux (x86_64-unknown-linux-gnu, 1.59.0)	6m 22s
build (stable, thumbv7em-none-eabi)	28s
windows (stable, x86_64-pc-windows-gnu)	1m 31s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	3m 58s
linux (x86_64-unknown-linux-gnu, stable)	2m 55s
build (stable, wasm32-unknown-unknown)	29s
cross (stable, aarch64-unknown-linux-gnu, default)	58s
cross (stable, powerpc-unknown-linux-gnu, default)	58s
cross (stable, aarch64-unknown-linux-gnu, asm)	53s
	59m 12s

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