Bump edition to 2024; MSRV 1.85 #141

Job	Run time
test (1.85)	30s
test (stable)	30s
build (stable, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	20s
build (1.85, wasm32-unknown-unknown)	17s
build (1.85, thumbv7em-none-eabi)	17s
	2m 13s

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