CI: bump `clippy` to v1.84; enable `--all-features` (#94) #203

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	8s
test (1.81.0)	44s
no_std (1.81.0, thumbv7em-none-eabi)	24s
cross (powerpc-unknown-linux-gnu, 1.81.0)	1m 17s
test (stable)	52s
cross (powerpc-unknown-linux-gnu, stable)	1m 11s
no_std (1.81.0, wasm32-unknown-unknown)	19s
no_std (stable, thumbv7em-none-eabi)	20s
no_std (stable, wasm32-unknown-unknown)	20s
	5m 35s

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