Governor Janet Mills has declined to act on legislation that would allow betting on sports in Maine. Her office said Wednesday that the governor would have three days to sign or veto the sports betting bill once lawmakers return in January of next year. “The Legislature has passed a significant number of bills this session, and I take seriously my constitutional obligation to thoroughly review all of them, evaluate their implications and decide whether they are in the best interest of Maine people,” Mills said in a statement. “I will continue to review these bills and gather more information, and…