Upgrade PySide6 multi-camera GUI #2

Job	Run time
Test / smoke (matrix) (3.11)	1m 15s
Test / smoke (matrix) (3.12)	1m 18s
Test / smoke (matrix) (3.10)	1m 23s
Build release artifacts (single)	0s
Publish to PyPI (OIDC)	0s
	3m 56s

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