By Madeline Coleman The basketball star has been held in Russia since February after officials said they discovered vape cartridges containing hashish oil in her luggage. Brittney Griner is one of the WNBA’s brightest stars. The 31-year-old is a seven-time All-Star, a two-time Olympic gold medalist and since 2015, she has competed UMMC Ekaterinburg in the Euroleague during the WNBA’s offseason. But instead of playing alongside her Mercury teammates when the season tipped off on May 6, Griner has been detained in Russia since February. She was taken into custody at Sheremetyevo International Ai…