chore: Bump mini_racer from 0.13.0 to 0.15.0 (#882)

Bumps [mini_racer](https://github.com/discourse/mini_racer) from 0.13.0 to 0.15.0.
- [Changelog](https://github.com/rubyjs/mini_racer/blob/main/CHANGELOG)
- [Commits](https://github.com/discourse/mini_racer/compare/v0.13.0...v0.15.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -43,4 +43,4 @@ gem 'loofah', '>= 2.3.1'
 # gem 'ruby-oembed'
 gem 'terminal-table'
 
-gem "mini_racer", "~> 0.13.0"
+gem "mini_racer", "~> 0.15.0"

Gemfile.lock

@@ -184,8 +184,8 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     language_server-protocol (3.17.0.3)
-    libv8-node (22.5.1.0)
-    libv8-node (22.5.1.0-x86_64-linux)
+    libv8-node (22.7.0.4)
+    libv8-node (22.7.0.4-x86_64-linux)
     liquid (4.0.4)
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -196,8 +196,8 @@ GEM
       nokogiri (>= 1.12.0)
     mercenary (0.4.0)
     mini_portile2 (2.8.7)
-    mini_racer (0.13.0)
-      libv8-node (~> 22.5.1.0)
+    mini_racer (0.15.0)
+      libv8-node (~> 22.7.0.1)
     minitest (5.25.1)
     nokogiri (1.16.7)
       mini_portile2 (~> 2.8.2)
@@ -334,7 +334,7 @@ DEPENDENCIES
   listen
   loofah (>= 2.3.1)
   mercenary
-  mini_racer (~> 0.13.0)
+  mini_racer (~> 0.15.0)
   minima!
   nokogiri (>= 1.10.4)
   rack (~> 3.1.7)