Build(deps): Bump mini_racer from 0.2.9 to 0.2.10 (#9507)

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.2.9 to 0.2.10.
- [Release notes](https://github.com/discourse/mini_racer/releases)
- [Changelog](https://github.com/rubyjs/mini_racer/blob/master/CHANGELOG)
- [Commits](https://github.com/discourse/mini_racer/compare/v0.2.9...v0.2.10)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -187,8 +187,8 @@ GEM
     method_source (0.9.2)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
-    mini_racer (0.2.9)
-      libv8 (>= 6.9.411)
+    mini_racer (0.2.10)
+      libv8 (> 7.3)
     mini_scheduler (0.12.2)
       sidekiq
     mini_sql (0.2.5)