GameStop CEO Ryan Cohen’s dream of taking on Amazon by buying eBay is officially dead, at least for now. The online marketplace said Tuesday that it has rejected the brick-and-mortar video game retailer’s unsolicited bid to take over the company. “We have concluded that your proposal is neither credible nor attractive,” eBay Chairman Paul Pressler wrote in a letter to Cohen. Pressler said eBay’s board made its decision after a thorough review of GameStop’s proposal. He listed several reasons for the rejection, including eBay’s standalone prospects, the uncertainty around GameStop’s financing, and the impact the deal could have on eBay’s long-term growth and profitability. The rejection comes a little over a week after GameStop made its bid to buy eBay for $125 per share in a deal worth roughly $56 billion , split between cash and GameStop stock.…