By Andrew Holleran A date has officially been set for Brittney Griner’s appeal hearing. On Monday, the Russian court system decided that Griner’s appeal hearing for her nine-year prison sentence will be held later in October. The official appeal hearing is set for Oct. 25. The Associated Press first reported the news: A Russian court on Monday set Oct. 25 as the date for American basketball star Brittney Griner’s appeal against her nine-year prison sentence for drug possession. Griner, an eight-time All-Star center with the WNBA’s Phoenix Mercury and two-time Olympic gold medalist, was convict…