Fix a silly typo

Author: Adam Gleitman

packages/react-native/sdks/hermes-engine/hermes-utils.rb

@@ -305,7 +305,7 @@ def findMatchingHermesVersion(package)
         return nil
     end
 
-    if packages['peerDependencies']
+    if package['peerDependencies']
         return package['peerDependencies']['react-native']
     end