Build(deps): Bump sprockets from 4.2.0 to 4.2.1 in /Builder (#1988)

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](rails/sprockets@v4.2.0...v4.2.1)

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

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

Builder/Gemfile.lock

@@ -234,7 +234,7 @@ GEM
       actionpack (>= 3.1)
       railties (>= 3.1)
       slim (>= 3.0, < 6.0, != 5.0.0)
-    sprockets (4.2.0)
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
     sprockets-rails (3.4.2)