Bump autoprefixer-rails from 10.2.5.1 to 10.4.16.0

Bumps [autoprefixer-rails](https://github.com/ai/autoprefixer-rails) from 10.2.5.1 to 10.4.16.0.
- [Changelog](https://github.com/ai/autoprefixer-rails/blob/master/CHANGELOG.md)
- [Commits](ai/autoprefixer-rails@10.2.5.1...10.4.16.0)

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

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

Gemfile.lock

@@ -69,8 +69,8 @@ GEM
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
     ast (2.4.2)
-    autoprefixer-rails (10.2.5.1)
-      execjs (> 0)
+    autoprefixer-rails (10.4.16.0)
+      execjs (~> 2)
     aws-eventstream (1.3.0)
     aws-partitions (1.856.0)
     aws-sdk-core (3.188.0)
@@ -152,7 +152,7 @@ GEM
       railties (>= 3.2)
     erubi (1.12.0)
     excon (0.71.0)
-    execjs (2.8.1)
+    execjs (2.9.1)
     faker (3.2.1)
       i18n (>= 1.8.11, < 2)
     faraday (0.17.6)