Bump sprockets from 4.2.0 to 4.2.1

Bumps [sprockets](https://github.com/rails/sprockets) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/rails/sprockets/releases)
- [Changelog](https://github.com/rails/sprockets/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rails/sprockets/compare/v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: sprockets
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -604,7 +604,7 @@ GEM
     spring (2.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (4.2.0)
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
     sprockets-es6 (0.9.2)
@@ -769,7 +769,7 @@ DEPENDENCIES
   social-share-button (~> 1.2.4)
   spring (~> 2.1.1)
   spring-commands-rspec (~> 1.0.4)
-  sprockets (~> 4.2.0)
+  sprockets (~> 4.2.1)
   turbolinks (~> 5.2.1)
   turnout (~> 2.5.0)
   uglifier (~> 4.2.0)