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] <[email protected]>

Gemfile.lock

@@ -181,13 +181,13 @@ GEM
       railties (>= 6.0.0)
     json (2.7.2)
     language_server-protocol (3.17.0.3)
-    libv8-node (18.19.0.0)
-    libv8-node (18.19.0.0-aarch64-linux)
-    libv8-node (18.19.0.0-aarch64-linux-musl)
-    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 (18.19.0.0-x86_64-linux-musl)
+    libv8-node (21.7.2.0)
+    libv8-node (21.7.2.0-aarch64-linux)
+    libv8-node (21.7.2.0-aarch64-linux-musl)
+    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)
+    libv8-node (21.7.2.0-x86_64-linux-musl)
     loofah (2.22.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -199,8 +199,8 @@ GEM
     marcel (1.0.4)
     mini_magick (4.12.0)
     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)
     minitest (5.22.3)
     msgpack (1.7.2)
     multi_json (1.15.0)