Update dependencies

Gemfile.lock

@@ -4,14 +4,14 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
-    ffi (1.15.0)
-    ffi (1.15.0-x64-mingw32)
+    ffi (1.15.1)
+    ffi (1.15.1-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (1.8.10)
@@ -42,9 +42,9 @@ GEM
     jekyll-target-blank (2.0.0)
       jekyll (>= 3.0, < 5.0)
       nokogiri (~> 1.10)
-    jekyll-toc (0.17.0)
+    jekyll-toc (0.17.1)
       jekyll (>= 3.9)
-      nokogiri (~> 1.10)
+      nokogiri (~> 1.11)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (2.3.1)
@@ -56,17 +56,17 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
-    mini_portile2 (2.5.1)
-    nokogiri (1.11.3)
+    mini_portile2 (2.5.3)
+    nokogiri (1.11.7)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
-    nokogiri (1.11.3-x64-mingw32)
+    nokogiri (1.11.7-x64-mingw32)
       racc (~> 1.4)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     racc (1.5.2)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)