fix(deps): update dependency scratch-sb1-converter to v2.0.243 #15908

Job	Run time
Build	7m 23s
Test scratch-render	3m 41s
Test scratch-svg-renderer	2m 37s
Test scratch-vm	4m 48s
Test scratch-gui	5m 23s
Publish preview playgrounds to GitHub Pages	51s
Test Results	4s
	24m 47s

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