Bump nokogiri from 1.8.5 to 1.13.6

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.5 to 1.13.6.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.8.5...v1.13.6)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
...

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

Gemfile

@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 gem 'rails', '~>4.2.11.1'
 
 gem "actionview", ">= 4.2.11.1"
-gem "nokogiri", "= 1.8.5"
+gem "nokogiri", "1.13.6"
 gem "activejob", ">= 4.2.11"
 gem "rack", ">= 1.6.11"
 gem "loofah", ">= 2.2.3"

Gemfile.lock

@@ -212,15 +212,16 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
     mini_mime (1.0.1)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.0)
     minitest (5.13.0)
     multi_json (1.13.1)
     mysql2 (0.3.21)
     net-scp (2.0.0)
       net-ssh (>= 2.6.5, < 6.0.0)
     net-ssh (4.2.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.13.6)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     nokogumbo (2.0.1)
       nokogiri (~> 1.8, >= 1.8.4)
     number_to (0.7.1)
@@ -244,6 +245,7 @@ GEM
     public_suffix (3.0.3)
     pundit (2.0.1)
       activesupport (>= 3.0.0)
+    racc (1.6.0)
     rack (1.6.11)
     rack-accept (0.4.5)
       rack (>= 0.4)
@@ -463,7 +465,7 @@ DEPENDENCIES
   loofah (>= 2.2.3)
   mysql2 (~> 0.3.18)
   net-ssh (< 5.0)
-  nokogiri (= 1.8.5)
+  nokogiri (= 1.13.6)
   number_to (~> 0.7.1)
   paper_trail (~> 4.0.0)
   poltergeist (~> 1.6.0)