Bump mini_racer from 0.6.4 to 0.18.1

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.6.4 to 0.18.1.
- [Changelog](https://github.com/rubyjs/mini_racer/blob/main/CHANGELOG)
- [Commits](rubyjs/mini_racer@v0.6.4...v0.18.1)

---
updated-dependencies:
- dependency-name: mini_racer
  dependency-version: 0.18.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile

@@ -133,7 +133,7 @@ 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", "~> 0.18.1" # TODO: audit whether we can remove this
 end
 
 group :test do

Gemfile.lock

@@ -1954,7 +1954,7 @@ GEM
       letter_opener (~> 1.9)
       railties (>= 6.1)
       rexml
-    libv8-node (16.19.0.1-x86_64-linux)
+    libv8-node (23.6.1.0-x86_64-linux)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -1985,8 +1985,8 @@ GEM
       benchmark
       logger
     mini_mime (1.1.5)
-    mini_racer (0.6.4)
-      libv8-node (~> 16.19.0.0)
+    mini_racer (0.18.1)
+      libv8-node (~> 23.6.1.0)
     minitest (5.25.5)
     minitest-reporters (1.7.1)
       ansi
@@ -2279,7 +2279,7 @@ DEPENDENCIES
   material_icons
   memory_profiler
   meta-tags
-  mini_racer (~> 0.6.3)
+  mini_racer (~> 0.18.1)
   minitest-reporters (~> 1.1)
   onebox!
   paperclip