Build(deps): Bump sassc from 2.0.1 to 2.2.1 (#8493)

Bumps [sassc](https://github.com/sass/sassc-ruby) from 2.0.1 to 2.2.1.
- [Release notes](https://github.com/sass/sassc-ruby/releases)
- [Changelog](https://github.com/sass/sassc-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/sassc-ruby/compare/v2.0.1...v2.2.1)

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

Gemfile.lock

@@ -366,9 +366,8 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.8.0)
       nokogumbo (~> 2.0)
-    sassc (2.0.1)
+    sassc (2.2.1)
       ffi (~> 1.9)
-      rake
     sassc-rails (2.1.1)
       railties (>= 4.0.0)
       sassc (>= 2.0)