A federal appeals court has declined to tackle the issue of whether Illinois’ constitution bars the reduction of health-care benefits for retired public-sector employees in Chicago. A unanimous six-page decision by a three-judge panel of 7th U.S. Circuit Court of Appeals posted late Wednesday said the dispute is still winding its way through state channels and that it won’t intervene. “We are reluctant to resolve a novel issue of state constitutional law,” the opinion written by Judge Frank H …