bundle update ffi in test app

Author: deivid-rodriguez

test_app/Gemfile.lock

@@ -94,7 +94,7 @@ GEM
     docile (1.1.5)
     erubi (1.7.1)
     execjs (2.7.0)
-    ffi (1.9.23)
+    ffi (1.9.25)
     formtastic (3.1.5)
       actionpack (>= 3.2.13)
     formtastic_i18n (0.6.0)