UI Tests

Update to JupyterLab `4.3.0rc1` #2162

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Run time

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Job	Run time
Build	4m 25s
Build	4m 25s
ui-tests (firefox)	6m 4s
ui-tests (firefox)	5m 38s
ui-tests (chromium)	5m 16s
ui-tests (chromium)	4m 58s
	30m 46s