Bump loofah from 2.2.3 to 2.3.1

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.3 to 2.3.1.
- [Release notes](https://github.com/flavorjones/loofah/releases)
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](flavorjones/loofah@v2.2.3...v2.3.1)

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

Gemfile

@@ -84,7 +84,7 @@ gem 'slim-rails'
 gem 'annotate', '~> 2.7', '>= 2.7.1'
 
 # Specify these versions because of security vulnerabilities.
-gem 'loofah', '~> 2.2', '>= 2.2.3'
+gem 'loofah', '~> 2.3'
 gem 'sprockets', '~> 3.7', '>= 3.7.2'
 gem 'rails-html-sanitizer', '~> 1.0', '>= 1.0.4'
 gem 'ffi', '~> 1.9', '>= 1.9.25'

Gemfile.lock

@@ -74,7 +74,7 @@ GEM
       term-ansicolor (~> 1.3)
       thor (~> 0.19.4)
       tins (~> 1.6)
-    crass (1.0.4)
+    crass (1.0.5)
     delayed_job (4.1.5)
       activesupport (>= 3.0, < 5.3)
     delayed_job_active_record (4.1.3)
@@ -126,7 +126,7 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.2.3)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)
@@ -141,13 +141,13 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
     mini_mime (1.0.1)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.13.1)
     nenv (0.3.0)
     nio4r (2.3.1)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.5)
+      mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -303,7 +303,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (~> 3.0.5)
-  loofah (~> 2.2, >= 2.2.3)
+  loofah (~> 2.3)
   magic_lamp (~> 1.8, >= 1.8.1)
   pg (~> 0.18)
   phantomjs