Update `hex-literal` to v0.4 (#62) #154

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 27s
build (1.65.0, wasm32-unknown-unknown)	1m 21s
minimal-versions	0s
build (stable, thumbv7em-none-eabi)	15s
test (1.72.0)	17s
build (stable, wasm32-unknown-unknown)	14s
test (stable)	21s
	3m 55s

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