Bump ffi from 1.9.17 to 1.12.2 in /rails/embedded_analytics

Bumps [ffi](https://github.com/ffi/ffi) from 1.9.17 to 1.12.2.
- [Release notes](https://github.com/ffi/ffi/releases)
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](ffi/ffi@1.9.17...1.12.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

rails/embedded_analytics/Gemfile.lock

@@ -60,7 +60,7 @@ GEM
       warden (~> 1.2.3)
     erubis (2.7.0)
     execjs (2.7.0)
-    ffi (1.9.17)
+    ffi (1.12.2)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
     i18n (0.9.5)