Merge pull request #1235 from reactjs/dependabot/bundler/loofah-2.19.1

Bump loofah from 2.18.0 to 2.19.1

Author: ahangarha

Gemfile.lock

@@ -133,7 +133,7 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.18.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)