Bump js-sys from 0.3.69 to 0.3.70 #1874

Job	Run time
Wheel on macos-12 py-3.8	3m 3s
Checks	58s
Wheel on ubuntu-latest py-3.8	2m 48s
Wheel on windows-latest py-3.8	2m 29s
coverage	8m 26s
Run fuzz targets (macos-12, 3.8)	21m 8s
Unit tests (macos-12, 3.8)	5m 8s
Run fuzz targets (ubuntu-latest, 3.8)	13m 0s
Unit tests (ubuntu-latest, 3.8)	4m 18s
Unit tests (windows-latest, 3.8)	5m 54s
Upload to PyPI	20s
	1h 7m 32s

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