Bump rails-html-sanitizer from 1.4.3 to 1.5.0 (#757)

Gemfile.lock

@@ -218,7 +218,7 @@ GEM
     matrix (0.4.2)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.1)
     minitest (5.16.2)
     multi_json (1.15.0)
     multi_xml (0.6.0)
@@ -261,7 +261,7 @@ GEM
     public_suffix (4.0.7)
     puma (5.6.5)
       nio4r (~> 2.0)
-    racc (1.6.1)
+    racc (1.6.2)
     rack (2.2.4)
     rack-canonical-host (1.1.0)
       addressable (> 0, < 3)
@@ -295,8 +295,8 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.3)
-      loofah (~> 2.3)
+    rails-html-sanitizer (1.5.0)
+      loofah (~> 2.19, >= 2.19.1)
     rails_12factor (0.0.3)
       rails_serve_static_assets
       rails_stdout_logging