Yankees’ pitching upgrades could come from within

Luis Severino isn’t the only addition the Yankees may make to their pitching staff for the stretch run. Right-hander Deivi Garcia is slated to make his debut with Triple-A Scranton/Wilkes-Barre on Monday against Columbus. The 20-year-old was promoted from Double-A Trenton after starting the Futures Game in Cleveland last week. Aaron Boone also noted Sunday,…