Bump autoprefixer-rails from 10.4.19.0 to 10.4.21.0

Bumps [autoprefixer-rails](https://github.com/ai/autoprefixer-rails) from 10.4.19.0 to 10.4.21.0.
- [Changelog](https://github.com/ai/autoprefixer-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ai/autoprefixer-rails/compare/10.4.19.0...10.4.21.0)

---
updated-dependencies:
- dependency-name: autoprefixer-rails
  dependency-version: 10.4.21.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -106,7 +106,7 @@ GEM
     audited (5.8.0)
       activerecord (>= 5.2, < 8.2)
       activesupport (>= 5.2, < 8.2)
-    autoprefixer-rails (10.4.19.0)
+    autoprefixer-rails (10.4.21.0)
       execjs (~> 2)
     base64 (0.2.0)
     bcrypt (3.1.20)
@@ -227,7 +227,7 @@ GEM
       execjs
       multi_json (>= 1.3)
       rake
-    execjs (2.9.1)
+    execjs (2.10.0)
     exiftool (1.2.6)
       json
     exiftool_vendored (12.97.0)
@@ -743,7 +743,7 @@ DEPENDENCIES
   airbrake (~> 13.0.5)
   ancestry (~> 4.3.3)
   audited (~> 5.8.0)
-  autoprefixer-rails (~> 10.4.19)
+  autoprefixer-rails (~> 10.4.21)
   bing_translator (~> 6.2.0)
   cancancan (~> 3.6.1)
   capistrano (~> 3.19.2)