Bump @rails/actioncable from 7.2.100 to 8.0.100 in /demo #7887

Job	Run time
Accessibility	4m 2s
Components (6.1.1, 3.0)	55s
Lib (6.1.1, 3.0)	1m 22s
Components (7.0.3, 3.0)	56s
Lib (7.0.3, 3.0)	1m 13s
Components (7.1.3, 3.2)	58s
Components (7.1.3, 3.3)	52s
Lib (7.1.3, 3.2)	1m 7s
Components (main, 3.2)	1m 23s
Lib (7.1.3, 3.3)	1m 13s
Components (main, 3.3)	1m 26s
Performance (6.1.1, 3.0)	37s
Lib (main, 3.2)	1m 17s
CSS coverage	1m 19s
Performance (7.0.3, 3.0)	42s
Lib (main, 3.3)	1m 18s
Performance (7.1.3, 3.2)	36s
System (Chrome)	6m 50s
System (Firefox)	5m 29s
Performance (7.1.3, 3.3)	31s
Performance (main, 3.2)	46s
Visual and Semantic Markup Regressions	11m 30s
Performance (main, 3.3)	52s
	47m 14s

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