SPRINGFIELD — The state’s highest court will hear oral arguments in nine cases this week, including that of a 9-year-old whose confession to beating a toddler to death was quashed because of a Miranda rights violation. The justices return to the capital for the second week of their November term after opening it last week with arguments in six criminal cases. In In re D.L.H. Jr., which was set to be argued today, the 5th District Appellate Court last year ruled that the juvenile did not “knowingly …