Bump ffi from 1.16.3 to 1.17.1 in /gemfiles/2.7

Bumps [ffi](https://github.com/ffi/ffi) from 1.16.3 to 1.17.1.
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](ffi/ffi@v1.16.3...v1.17.1)

---
updated-dependencies:
- dependency-name: ffi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gemfiles/2.7/Gemfile.lock

@@ -7,7 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    ffi (1.16.3)
+    ffi (1.17.1)
     onigmo (0.1.0)
     parser (3.3.6.0)
       ast (~> 2.4.1)