ZURICH (Reuters) – Switzerland’s highest court has dismissed an appeal by a former UBS banker convicted in absentia of espionage for selling information about wealthy clients to German tax authorities. Rene S., as the 48-year-old ex-banker was called during court proceedings, was sentenced to 40 months in prison plus fines and court costs worth more than 125,000 Swiss francs ($125,200) when a lower court found him guilty in 2019 of spying and money laundering. An appeals court in 2020 upheld the verdict, as did the Swiss Federal Court in a ruling released on Thursday. It dismissed his argument…