Bump clap from 4.5.20 to 4.5.21 #1978

Job	Run time
Wheel on macos-13 py-3.8	2m 7s
Wheel on ubuntu-latest py-3.8	1m 44s
Wheel on windows-latest py-3.8	2m 53s
coverage	7m 28s
Checks	58s
Run fuzz targets (macos-13, 3.8)	18m 17s
Run fuzz targets (ubuntu-latest, 3.8)	13m 57s
Unit tests (macos-13, 3.8)	5m 25s
Unit tests (ubuntu-latest, 3.8)	3m 26s
Unit tests (windows-latest, 3.8)	6m 43s
Upload to PyPI	7s
	1h 3m 5s

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