ALLEN PARK, Mich. — You’ve been warned, Lions fans. The opening night of the 2024 NFL draft, which will be held in downtown Detroit in late April, might not be as dramatic or entertaining as the past few were for your team. “I just know that we’re picking later, so they’re going to be waiting to see our pick,” Holmes said last month. “And if we trade out of the first round, I’ll just send a memo: ‘Don’t be as upset.’” But upsets do happen. And if we’ve learned anything about Holmes in his first three years as the Lions’ general manager, it’s that he’s not afraid to make a deal or two. Or six, …