Another offseason, another summer of trade rumors. That had Tyler Herro offering a resigned smile Tuesday at a Miami Heat back-to-school event at Target at Dadeland Station. “I mean, every summer, that’s just what it is,” Herro said after helping a group of youths fill their back-to-school carts. “I mean, ever since I’ve been here, my name’s been in rumors. So rumors, like I said last summer, they don’t bother me. I’m just getting ready for this season and whether I’m on the Heat or somewhere else, I’m getting ready for the season.”