A Paterson police sergeant convicted last month for crimes committed while supervising cops who robbed residents is seeking a new trial after accusing federal prosecutors of misconduct for calling the officers as witnesses against him. In a brief filed in Newark federal court Friday, lawyers for Paterson police Sgt. Michael Cheff argued that the entire case relied on testimony from five officers prosecutors should not have trusted because they robbed residents, used excessive force and falsified reports. “(Prosecutors) improperly vouched for its witnesses,” the attorneys wrote, calling it “pro…