SPRINGFIELD — The state’s top lawyer is still pushing for new protections from lead-contaminated drinking water after lawmakers failed to approve them this year.Attorney General Lisa M. Madigan still wants legislators to green light a measure requiring older schools with younger children to test their water sources for lead. A version of the bill passed the state Senate earlier this year, but the House didn’t take it up.Senate Bill 550 would mandate day care centers and schools that were built before …