Update `hex-literal` to v0.4 #149

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 33s
minimal-versions	0s
build (1.65.0, wasm32-unknown-unknown)	1m 28s
build (stable, thumbv7em-none-eabi)	24s
test (1.72.0)	20s
build (stable, wasm32-unknown-unknown)	22s
test (stable)	26s
	4m 33s

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