[Security] Bump loofah from 2.2.3 to 2.3.1 (#12203)

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.3 to 2.3.1. **This update includes a security fix.**
- [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/v2.2.3...v2.3.1)

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

Gemfile.lock

@@ -184,7 +184,7 @@ GEM
     connection_pool (2.2.2)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
-    crass (1.0.4)
+    crass (1.0.5)
     css_parser (1.7.0)
       addressable
     debug_inspector (0.0.3)
@@ -356,7 +356,7 @@ GEM
       activesupport (>= 4)
       railties (>= 4)
       request_store (~> 1.0)
-    loofah (2.2.3)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)