Whispers of a refresh to the PlayStation 5 have been rumbling on in the background for some time, but the upcoming release of Grand Theft Auto VI might spur Sony into taking action. At least, that’s the theory floated by some analysts, who claim an upgraded PS5 — dubbed PS5 Pro, following the same naming convention used last generation — could launch later this year. The system, which will purportedly have upgraded internals for improved performance, will be billed as the definitive way to play Rockstar’s upcoming Grand Theft Auto VI (GTA 6) game. Serkan Toto, of Tokyo-based consultancy compan…