Bump clap from 4.5.20 to 4.5.21 #2216

Job	Run time
check	2m 32s
integration-test-althea-payment	15m 10s
integration-test-debts	15m 33s
clippy	3m 50s
audit	9s
integration-test-eth-payments	14m 3s
integration-test-five-nodes	11m 10s
integration-test-multi-exit	10m 44s
integration-test-validate-contract	10m 30s
rustfmt	4s
test	3m 46s
integration-test-db-migration	11m 25s
cross-aarch64	0s
cross-armv7	0s
	1h 38m 56s

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