[Security] Bump loofah from 2.2.2 to 2.2.3

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.2 to 2.2.3. **This update includes security fixes.**
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flavorjones/loofah/compare/v2.2.2...v2.2.3)

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

Gemfile.lock

@@ -244,7 +244,7 @@ GEM
       actionmailer (>= 3.2)
       letter_opener (~> 1.0)
       railties (>= 3.2)
-    loofah (2.2.2)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
@@ -270,7 +270,7 @@ GEM
       net-ssh (>= 2.6.5)
     net-ssh (5.0.2)
     newrelic_rpm (4.1.0.333)
-    nokogiri (1.8.4)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     nori (2.6.0)
     oauth (0.5.3)