The Boss’s cryptic internet antics continued Wednesday. But this time, we at least got a date. Legendary rock star and New Jersey native Bruce Springsteen teased his 21st studio album on Instagram for the third day in a row Wednesday morning. Although the first two posts were just photos, the latest was a video and seems to be pointing more clearly toward an announcement. The post Wednesday featured a car radio moving around the dial playing different songs sung by Springsteen. The caption? “Turn it up tomorrow, September 29th at 10:00 AM ET!” Does that mean the record is dropping Thursday at …