“The Gray Man” is returning for another mission. A sequel to the recently released spy thriller starring Ryan Gosling is in development at Netflix, as is a spinoff that will explore an entirely different story line, the streaming service announced Tuesday. Gosling and directors Joe and Anthony Russo will each return for the sequel film. “The audience reaction to The Gray Man has been nothing short of phenomenal,” the Russo brothers said in a statement. “We are so appreciative of the enthusiasm that fans across the world have had for this film. “With so many amazing characters in the movie, we …