Four U.S. sorghum shipments initially bound for China have been diverted to other countries after Beijing's move last week to impose hefty anti-dumping deposits on imports of the grain from the United States, according to trade sources and Reuters shipping data.Three of the cargoes are now sailing for Saudi Arabia after being sold to a private buyer, a U.S. trader and a Middle East-based trading source with knowledge of the matter said Tuesday. A fourth ship is heading to Japan…