WASHINGTON — The Senate Judiciary Committee said Wednesday that confirmation hearings for Supreme Court nominee Ketanji Brown Jackson will begin March 21, keeping the Senate on track for a possible final vote next month.Sen. Dick Durbin, the committee chairman, announced the hearing schedule on Wednesday as Jackson was holding her first meetings with senators on Capitol Hill. Jackson met in the morning with Senate Majority Leader Chuck Schumer, D-N.Y., and Senate Republican leader Mitch McConnell of Kentucky. She planned …