Merge branch '331517-update-ffi-to-.1.15.0' into 'master'

Update ffi from 1.13.1 to 1.15.1

See merge request gitlab-org/gitlab!62207

Gemfile.lock

@@ -366,7 +366,7 @@ GEM
     fast_blank (1.0.0)
     fast_gettext (1.6.0)
     ffaker (2.10.0)
-    ffi (1.13.1)
+    ffi (1.15.1)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
       rake