Update clap to v4 #87

Job	Run time
no_std Check	23s
Test Suite (stable, --no-default-features)	19s
Lints (stable, --no-default-features)	12s
Check (stable, --no-default-features)	21s
Test Suite (stable, --all-features)	20s
Lints (stable, --all-features)	10s
Test Suite (beta, --no-default-features)	24s
Lints (beta, --no-default-features)	13s
Check (stable, --all-features)	20s
Test Suite (beta, --all-features)	24s
Lints (beta, --all-features)	12s
Check (beta, --no-default-features)	28s
Test Suite (nightly, --no-default-features)	27s
Lints (nightly, --no-default-features)	17s
Check (beta, --all-features)	32s
Test Suite (nightly, --all-features)	31s
Lints (nightly, --all-features)	20s
Check (nightly, --no-default-features)	17s
Check (nightly, --all-features)	17s
	6m 27s

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