Bump loofah from 2.2.0 to 2.2.1

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flavorjones/loofah/commits)

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

Gemfile.lock

@@ -92,7 +92,7 @@ GEM
       activesupport (>= 4.0)
       logstash-event (~> 1.2.0)
       request_store
-    loofah (2.2.0)
+    loofah (2.2.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lrucache (0.1.4)