Three and one-half stars. Rated PG-13. 134 minutes. As if on cue, “Only the Brave” — a deeply moving drama about firefighters — arrives in theaters, just as the catastrophic wildfires in Northern California seem to be winding down. Directed by Joseph Kosinski, from a screenplay by Ken Nolan and Eric Warren Singer, the film is based on a GQ story about the Granite Mountain Hotshots, an elite crew of firefighters who experienced a harrowing tragedy in Yarnell, Ariz., in 2013.