UI Tests

Update to JupyterLab `4.3.0a1` #2065

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Run time

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Job	Run time
Build	4m 45s
Build	4m 45s
Build	4m 45s
ui-tests (firefox)	5m 18s
ui-tests (firefox)	5m 15s
ui-tests (firefox)	5m 22s
ui-tests (chromium)	3m 7s
ui-tests (chromium)	3m 7s
ui-tests (chromium)	3m 7s
	39m 31s