Bump autoprefixer-rails from 9.7.3 to 9.7.4

Bumps [autoprefixer-rails](https://github.com/ai/autoprefixer-rails) from 9.7.3 to 9.7.4.
- [Release notes](https://github.com/ai/autoprefixer-rails/releases)
- [Changelog](https://github.com/ai/autoprefixer-rails/blob/master/CHANGELOG.md)
- [Commits](ai/autoprefixer-rails@9.7.3...9.7.4)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -41,7 +41,7 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     arel (8.0.0)
-    autoprefixer-rails (9.7.3)
+    autoprefixer-rails (9.7.4)
       execjs
     backports (3.15.0)
     bindex (0.8.1)