updating gemlock to avoid vulnerabilities

Author: SyntaxC4

Gemfile.lock

@@ -63,15 +63,15 @@ GEM
     concurrent-ruby (1.0.5)
     erubi (1.6.1)
     execjs (2.7.0)
-    ffi (1.9.18-x64-mingw32)
-    ffi (1.9.18-x86-mingw32)
+    ffi (1.9.24)
+    ffi (1.9.24)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
     i18n (0.8.6)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
-    loofah (2.0.3)
+    loofah (2.2.1)
       nokogiri (>= 1.5.9)
     mail (2.6.6)
       mime-types (>= 1.16, < 4)
@@ -107,7 +107,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.3)
+    rails-html-sanitizer (1.0.4)
       loofah (~> 2.0)
     railties (5.1.2)
       actionpack (= 5.1.2)
@@ -119,7 +119,7 @@ GEM
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rubyzip (1.2.1)
+    rubyzip (1.2.2)
     sass (3.5.1)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -134,7 +134,7 @@ GEM
     selenium-webdriver (3.4.4)
       childprocess (~> 0.5)
       rubyzip (~> 1.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)