Florida’s children rank 40th in the nation when it comes to their health, education and economic well-being, new data suggests, and close to a million of them are living in poverty — a number that dipped slightly from a year earlier. The report, released today by Florida Kids Count, part of a nationwide project of the Annie E. Casey Foundation, is designed to inform residents and lawmakers about the quality of life for Florida’s children. But the picture wasn’t rosy.