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Bump MSRV to 1.81 #1126

Job	Run time
minimal-versions / minimal-versions	49s
set-msrv / set-msrv	5s
linux (x86_64-unknown-linux-gnu, 1.81.0)	46s
macos (1.81.0)	27s
linux (x86_64-unknown-linux-gnu, stable)	30s
build (1.81.0, thumbv7em-none-eabi)	23s
macos (stable)	19s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	37s
build (1.81.0, wasm32-unknown-unknown)	20s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	37s
build (1.81.0, loongarch64-unknown-linux-gnu)	24s
cross (stable, aarch64-unknown-linux-gnu, default)	45s
build (stable, thumbv7em-none-eabi)	19s
windows (x86_64-pc-windows-gnu, 1.81.0)	1m 2s
cross (stable, powerpc-unknown-linux-gnu, default)	32s
build (stable, wasm32-unknown-unknown)	24s
windows (x86_64-pc-windows-gnu, stable)	1m 28s
build (stable, loongarch64-unknown-linux-gnu)	19s
	10m 6s

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