CI: bump `clippy` to v1.84 (#1644) #2706

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	26s
test (1.81.0)	42s
build (1.81.0, wasm32-unknown-unknown)	15s
test (stable)	41s
build (stable, thumbv7em-none-eabi)	30s
build (stable, wasm32-unknown-unknown)	22s
minimal-versions / minimal-versions	47s
	3m 43s

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