cms: remove `alloc` feature (#1566) #1086

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	22s
test (1.81.0)	22s
build (1.81.0, wasm32-unknown-unknown)	24s
test (stable)	25s
build (stable, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	15s
minimal-versions	0s
	2m 5s

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