hit single “Dynamite” to the highest bidder in a Beverly Hills, California, charity auction in January.The pink, blue, yellow and lavender pastel outfits the seven singers wore in the record-setting video are expected to fetch what Julien’s Auctions on Monday called a conservative estimate of $20,000 to $40,000.“This is the first time that BTS has ever sold any costumes,” said Martin Nolan, executive director of Julien’s Auctions.The costumes include the T-shirts, hats, sneakers, pants and