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base64ct: downgrade edition to 2021; MSRV 1.81 (#1702) #1774

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	23s
minimal-versions	0s
build (1.81.0, wasm32-unknown-unknown)	20s
test (1.81.0)	42s
build (stable, thumbv7em-none-eabi)	13s
test (stable)	34s
build (stable, wasm32-unknown-unknown)	17s
	2m 29s

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