chore: update gemlock

Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
     ffi (1.9.18)
     forwardable-extended (2.6.0)
@@ -24,23 +24,23 @@ GEM
       sass (~> 3.4)
     jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    kramdown (1.14.0)
+    kramdown (1.15.0)
     liquid (4.0.0)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     match_regex (0.1.0)
     mercenary (0.3.6)
-    pathutil (0.14.0)
+    pathutil (0.16.0)
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.13)
-    public_suffix (2.0.5)
+    public_suffix (3.0.1)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     rouge (1.11.1)
     safe_yaml (1.0.4)
-    sass (3.5.1)
+    sass (3.5.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)