Update ffi requirement from = 1.16.3 to 1.17.1

Updates the requirements on [ffi](https://github.com/ffi/ffi) to permit the latest version.
- [Changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ffi/ffi/commits)

---
updated-dependencies:
- dependency-name: ffi
  dependency-type: direct:production
...

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

Gemfile

@@ -9,7 +9,7 @@ source "https://rubygems.org"
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
 gem "jekyll", "~> 3.10.0"
-gem "ffi", "= 1.16.3"
+gem "ffi", "1.17.1"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "github-pages", group: :jekyll_plugins