build(deps): bump ffi from 1.12.2 to 1.13.0

Bumps [ffi](https://github.com/ffi/ffi) from 1.12.2 to 1.13.0.
- [Release notes](https://github.com/ffi/ffi/releases)
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](ffi/ffi@1.12.2...1.13.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Diff for: Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     execjs (2.7.0)
     faraday (1.0.1)
       multipart-post (>= 1.2, < 3)
-    ffi (1.12.2)
+    ffi (1.13.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
     github-pages (206)