Bump ffi from 1.9.18 to 1.11.1 (#216)

Bumps [ffi](https://github.com/ffi/ffi) from 1.9.18 to 1.11.1.
- [Release notes](https://github.com/ffi/ffi/releases)
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](ffi/ffi@1.9.18...1.11.1)

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

Author: dependabot[bot]

Gemfile.lock

@@ -45,7 +45,7 @@ GEM
     colored2 (3.1.2)
     concurrent-ruby (1.1.5)
     escape (0.0.4)
-    ffi (1.11.1)
+    ffi (1.11.3)
     fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)