CI: bump `clippy` to v1.84 (#1644) #1214

Job	Run time
minimal-versions	0s
test (1.81.0)	31s
build (1.81.0, thumbv7em-none-eabi)	23s
test (stable)	30s
build (1.81.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	24s
	2m 39s

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