Bump k256 from 0.13.3 to 0.13.4 #1924

Job	Run time
Wheel on macos-13 py-3.8	2m 33s
Wheel on ubuntu-latest py-3.8	2m 56s
Wheel on windows-latest py-3.8	2m 42s
Checks	49s
coverage	8m 24s
Run fuzz targets (macos-13, 3.8)	20m 58s
Unit tests (macos-13, 3.8)	9m 13s
Run fuzz targets (ubuntu-latest, 3.8)	12m 55s
Unit tests (ubuntu-latest, 3.8)	3m 48s
Unit tests (windows-latest, 3.8)	5m 55s
Upload to PyPI	27s
	1h 10m 40s

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