Bump loofah from 2.1.1 to 2.2.3

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.1.1 to 2.2.3.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.1.1...v2.2.3)

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

Gemfile.lock

@@ -60,7 +60,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.5)
-    crass (1.0.3)
+    crass (1.0.4)
     diff-lcs (1.3)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -79,7 +79,7 @@ GEM
     json (1.8.6)
     levenshtein-ffi (1.1.0)
       ffi (~> 1.9)
-    loofah (2.1.1)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)