There may have been some Irish slaves in Georgia the country in 1860, but I doubt that there were any in Georgia the US state.
The War of Independence ended the British government’s ability to ship English, Irish, Scottish, and Welsh debtors, criminals, and kidnapped people to the United States. After 1783, these people were shipped to Australia. By 1860, the indentured servants sent to the future U.S. before 1775 were dead or had been free.