UI Tests

Update to JupyterLab `4.3.0rc0` #2118

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Run time

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Job	Run time
Build	4m 29s
Build	4m 29s
ui-tests (firefox)	3m 29s
ui-tests (firefox)	3m 29s
ui-tests (chromium)	4m 58s
ui-tests (chromium)	5m 8s
	26m 2s