Bump mini_racer from 0.6.3 to 0.12.0

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.6.3 to 0.12.0.
- [Changelog](https://github.com/rubyjs/mini_racer/blob/main/CHANGELOG)
- [Commits](rubyjs/mini_racer@v0.6.3...v0.12.0)

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

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

Gemfile

@@ -114,7 +114,7 @@ end
 group :test, :production do
   gem 'pg', '~> 1.5'
 
-  gem "mini_racer", "~> 0.6.3" # TODO: audit whether we can remove this
+  gem "mini_racer", "~> 0.12.0" # TODO: audit whether we can remove this
 end
 
 group :test do

Gemfile.lock

@@ -1428,8 +1428,8 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     language_filter (0.3.01)
-    libv8-node (16.10.0.0)
-    libv8-node (16.10.0.0-x86_64-linux)
+    libv8-node (21.7.2.0)
+    libv8-node (21.7.2.0-x86_64-linux)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -1458,8 +1458,8 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.2)
-    mini_racer (0.6.3)
-      libv8-node (~> 16.10.0.0)
+    mini_racer (0.12.0)
+      libv8-node (~> 21.7.2.0)
     minitest (5.24.0)
     multi_json (1.15.0)
     multipart-post (2.3.0)
@@ -1723,7 +1723,7 @@ DEPENDENCIES
   material_icons
   memory_profiler
   meta-tags
-  mini_racer (~> 0.6.3)
+  mini_racer (~> 0.12.0)
   newrelic_rpm
   onebox!
   paperclip