FRANKFURT (Reuters) – European Central Bank policymakers are open to a change in their rhetoric at their next meeting, paving the way for an interest rate cut possibly in June, if upcoming data confirms inflation has been vanquished, four sources told Reuters. The ECB kept interest rates unchanged at a record-high 4% on Thursday and gave no hint that it is even contemplating a start to easing. But policymakers know that the time to start discussing a first rate cut is approaching, provided that inflation and wage data confirm that price growth is already heading to the ECB’s 2% goal this year,…