Bump nokogiri from 1.8.1 to 1.13.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.1 to 1.13.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.13.4/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.8.1...v1.13.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -1,12 +1,9 @@
 GIT
-  remote: git://github.com/rails/sass-rails.git
-  revision: dd04a6a6d19cbd7cfd2f9d304a445444e0b88a19
+  remote: https://github.com/rails/sass-rails.git
+  revision: 551251bddec4d6b75446cb1c1630ed26e5318f8e
   specs:
-    sass-rails (6.0.0.beta1)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.4)
-      sprockets (~> 4.x)
-      sprockets-rails (< 4.0)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
 
 GIT
   remote: https://github.com/rspec/rspec-core.git
@@ -174,7 +171,7 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.0)
     minitest (5.11.1)
     multi_json (1.13.1)
     mysql2 (0.4.10)
@@ -183,8 +180,9 @@ GEM
     net-ssh (4.2.0)
     net-telnet (0.1.1)
     nio4r (2.2.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     parallel (1.12.1)
     parser (2.4.0.2)
       ast (~> 2.3)
@@ -198,6 +196,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     puma (3.11.2)
+    racc (1.6.0)
     rack (2.0.3)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
@@ -239,11 +238,14 @@ GEM
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
     ruby_dep (1.5.0)
-    sass (3.5.5)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     schash (0.1.2)
     serviceworker-rails (0.5.5)
       railties (>= 3.1)