tests: Bump timeout to 5 hours
tests: Bump timeout to 5 hours

Align with observed run-times just above 4 hours for some hosts.
(transplanted from cb77dfd5db549453cd867dc5d4f5c4427cf4ae7c)

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin