By Laura Sanicola (Reuters) – Oil prices slipped on Tuesday from seven-year highs, pressured by speculation that producer group OPEC+ could decide to boost supply by more than flagged previously as well as expectations of a rise in U.S. inventories. While the Organization of the Petroleum Exporting Countries and allies, together known as OPEC+, has been expected to maintain its policy of gradual production increases at a monthly meeting on Wednesday, Goldman Sachs said there was a chance of a faster ramp up given the pace of the market’s recent rally. However, an OPEC+ technical panel did not …