Bump serde_json from 1.0.120 to 1.0.121 #1863

Job	Run time
Wheel on macos-12 py-3.8	2m 56s
Wheel on ubuntu-latest py-3.8	3m 5s
Wheel on windows-latest py-3.8	2m 42s
Checks	55s
Run fuzz targets (macos-12, 3.8)	18m 14s
Run fuzz targets (ubuntu-latest, 3.8)	13m 21s
Unit tests (macos-12, 3.8)	5m 27s
Unit tests (ubuntu-latest, 3.8)	3m 42s
coverage	8m 26s
Unit tests (windows-latest, 3.8)	5m 50s
Upload to PyPI	25s
	1h 5m 3s

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