Bump sanitize from 5.2.3 to 6.0.0

Bumps [sanitize](https://github.com/rgrove/sanitize) from 5.2.3 to 6.0.0.
- [Release notes](https://github.com/rgrove/sanitize/releases)
- [Changelog](https://github.com/rgrove/sanitize/blob/main/HISTORY.md)
- [Commits](rgrove/sanitize@v5.2.3...v6.0.0)

---
updated-dependencies:
- dependency-name: sanitize
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -116,7 +116,7 @@ gem 'traco'
 # WYSIWYG Text Editor
 gem 'tinymce-rails', '~> 5.6'
 gem 'tinymce-rails-langs', '~> 5.20200505'
-gem 'sanitize', '~> 5.2'
+gem 'sanitize', '~> 6.0'
 
 # Birthdate validation
 gem 'chronic', '~> 0.10.2'

Gemfile.lock

@@ -218,8 +218,6 @@ GEM
     nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogumbo (2.0.4)
-      nokogiri (~> 1.8, >= 1.8.4)
     open_id_authentication (1.3.0)
       rack-openid (~> 1.3)
     paperclip (6.1.0)
@@ -321,10 +319,9 @@ GEM
     rubyzip (2.3.0)
     safe_target_blank (1.0.2)
       rails
-    sanitize (5.2.3)
+    sanitize (6.0.0)
       crass (~> 1.0.2)
-      nokogiri (>= 1.8.0)
-      nokogumbo (~> 2.0)
+      nokogiri (>= 1.12.0)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -453,7 +450,7 @@ DEPENDENCIES
   rubocop
   ruby-openid
   safe_target_blank
-  sanitize (~> 5.2)
+  sanitize (~> 6.0)
   sassc-rails
   sdoc (~> 1.1.0)
   selenium-webdriver