Bump sprockets-rails from 3.2.1 to 3.2.2 (#14788)

Bumps [sprockets-rails](https://github.com/rails/sprockets-rails) from 3.2.1 to 3.2.2.
- [Release notes](https://github.com/rails/sprockets-rails/releases)
- [Commits](https://github.com/rails/sprockets-rails/compare/v3.2.1...v3.2.2

)

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Gemfile.lock

@@ -593,7 +593,7 @@ GEM
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.1)
+    sprockets-rails (3.2.2)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)