Bump loofah from 2.4.0 to 2.19.1

Gemfile.lock

@@ -74,7 +74,7 @@ GEM
     coffee-script-source (1.12.2)
     commonjs (0.2.7)
     concurrent-ruby (1.1.5)
-    crass (1.0.5)
+    crass (1.0.6)
     database_cleaner (1.7.0)
     derailed (0.1.0)
       derailed_benchmarks
@@ -147,7 +147,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.4.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -156,18 +156,21 @@ GEM
       mimemagic (~> 0.3.2)
     memory_profiler (0.9.14)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.6.1)
     minitest (5.13.0)
     msgpack (1.3.1)
     multi_json (1.14.1)
     multipart-post (2.1.1)
     net-http-persistent (2.9.4)
     net-http-pipeline (1.0.1)
     nio4r (2.5.2)
-    nokogiri (1.10.7)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     orm_adapter (0.5.0)
@@ -190,6 +193,7 @@ GEM
     pusher-client (0.6.2)
       json
       websocket (~> 1.0)
+    racc (1.6.1)
     rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)