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Bump MSRV to 1.81 (#631) #1127

Job	Run time
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	3s
linux (x86_64-unknown-linux-gnu, 1.81.0)	35s
build (1.81.0, thumbv7em-none-eabi)	24s
macos (1.81.0)	31s
linux (x86_64-unknown-linux-gnu, stable)	34s
build (1.81.0, wasm32-unknown-unknown)	22s
macos (stable)	21s
build (1.81.0, loongarch64-unknown-linux-gnu)	18s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	25s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	38s
windows (x86_64-pc-windows-gnu, 1.81.0)	55s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	39s
build (stable, loongarch64-unknown-linux-gnu)	16s
windows (x86_64-pc-windows-gnu, stable)	2m 9s
cross (stable, aarch64-unknown-linux-gnu, default)	35s
cross (stable, powerpc-unknown-linux-gnu, default)	29s
	10m 16s

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