Build(deps): Bump mini_racer from 0.9.0 to 0.12.0

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.9.0 to 0.12.0.
- [Changelog](https://github.com/rubyjs/mini_racer/blob/main/CHANGELOG)
- [Commits](rubyjs/mini_racer@v0.9.0...v0.12.0)

---
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.lock

@@ -182,10 +182,10 @@ GEM
       base64
     kgio (2.11.4)
     language_server-protocol (3.17.0.3)
-    libv8-node (18.19.0.0-aarch64-linux)
-    libv8-node (18.19.0.0-arm64-darwin)
-    libv8-node (18.19.0.0-x86_64-darwin)
-    libv8-node (18.19.0.0-x86_64-linux)
+    libv8-node (21.7.2.0-aarch64-linux)
+    libv8-node (21.7.2.0-arm64-darwin)
+    libv8-node (21.7.2.0-x86_64-darwin)
+    libv8-node (21.7.2.0-x86_64-linux)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -216,8 +216,8 @@ GEM
       rack (>= 1.1.3)
     method_source (1.1.0)
     mini_mime (1.1.5)
-    mini_racer (0.9.0)
-      libv8-node (~> 18.19.0.0)
+    mini_racer (0.12.0)
+      libv8-node (~> 21.7.2.0)
     mini_scheduler (0.16.0)
       sidekiq (>= 4.2.3, < 7.0)
     mini_sql (1.5.0)