Bump clap from 4.5.20 to 4.5.21 #1992

Job	Run time
Wheel on macos-13 py-3.8	1m 46s
Checks	42s
Wheel on ubuntu-latest py-3.8	1m 48s
coverage	7m 16s
Wheel on windows-latest py-3.8	2m 58s
Run fuzz targets (macos-13, 3.8)	20m 4s
Run fuzz targets (ubuntu-latest, 3.8)	14m 3s
Unit tests (macos-13, 3.8)	9m 53s
Unit tests (ubuntu-latest, 3.8)	3m 24s
Unit tests (windows-latest, 3.8)	6m 34s
Upload to PyPI	6s
	1h 8m 34s

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