NEW YORK — A raging fire tore through a Bronx apartment building Saturday morning, injuring nine people who were rushed to the hospital, including a pregnant woman — and forcing at least one person to jump from a window, FDNY officials and witnesses said. The fire quickly spread through the Grand Ave. building near W. 184th St. in University Heights after someone in apartment where the fire started left the door open — the same scenario that ended in 17 deaths during a devastating Bronx fire Jan. 9, fire officials said. The blaze erupted inside a third floor apartment of the six-story building…