A federal appeals court declined to revive a civil rights lawsuit brought by a former suburban school board member who claimed a school district investigation into her conduct was unconstitutional.The 7th U.S. Circuit Court of Appeals panel affirmed the lower court’s dismissal of Claudia and Noel Manley’s case against Hinsdale High School District 86 and Superintendent Bruce Law in a 13-page opinion issued Thursday.Bruce Davidson, a sole practitioner in Hinsdale who represents the Manleys, said his clients have …