Bump mini_racer from 0.2.15 to 0.6.3

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.2.15 to 0.6.3.
- [Release notes](https://github.com/discourse/mini_racer/releases)
- [Changelog](https://github.com/rubyjs/mini_racer/blob/master/CHANGELOG)
- [Commits](rubyjs/mini_racer@v0.2.15...v0.6.3)

---
updated-dependencies:
- dependency-name: mini_racer
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile

@@ -36,7 +36,7 @@ gem 'sparql', '3.1.7'
 gem 'linkeddata'
 gem 'loofah', '~>2.18.0'
 gem 'mini_magick', '~>4.11.0'
-gem 'mini_racer', '~> 0.2.15', platforms: :ruby
+gem 'mini_racer', '~> 0.6.3', platforms: :ruby
 gem 'nokogiri', '~>1.13.6'
 gem 'omniauth', '~> 2.0'
 gem 'omniauth-rails_csrf_protection'

Gemfile.lock

@@ -543,6 +543,7 @@ GEM
     legato (0.7.0)
       multi_json
     libv8 (7.3.492.27.1-x86_64-linux)
+    libv8-node (16.10.0.0-x86_64-linux)
     libxml-ruby (3.2.4)
     link_header (0.0.8)
     linkeddata (3.1.5)
@@ -593,8 +594,8 @@ GEM
     mime-types-data (3.2022.0105)
     mini_magick (4.11.0)
     mini_mime (1.1.2)
-    mini_racer (0.2.15)
-      libv8 (> 7.3)
+    mini_racer (0.6.3)
+      libv8-node (~> 16.10.0.0)
     minitest (5.16.3)
     multi_json (1.15.0)
     multi_xml (0.6.0)
@@ -1043,7 +1044,7 @@ DEPENDENCIES
   listen (~> 3.7.0)
   loofah (~> 2.18.0)
   mini_magick (~> 4.11.0)
-  mini_racer (~> 0.2.15)
+  mini_racer (~> 0.6.3)
   nokogiri (~> 1.13.6)
   omniauth (~> 2.0)
   omniauth-rails_csrf_protection