Bump sprockets from 3.7.5 to 4.2.1

Bumps [sprockets](https://github.com/rails/sprockets) from 3.7.5 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@v3.7.5...v4.2.1)

---
updated-dependencies:
- dependency-name: sprockets
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Gemfile

@@ -19,7 +19,7 @@ gem 'sass-rails', '~> 6.0.0'                                        # Ruby on Ra
 gem "solid_cable", '~> 3.0.7'                                       # Use the database-backed adapters for Action Cable
 gem "solid_cache", '~> 1.0.7'                                       # Use the database-backed adapters for Rails.cache
 gem "solid_queue", '~> 1.1.4'                                       # Use the database-backed adapters for Active Job
-gem "sprockets", '= 3.7.5'                                          # Rack-based asset packaging system
+gem "sprockets", '4.2.1'                                          # Rack-based asset packaging system
 gem "sprockets-rails", '~> 3.5.2'                                   # The asset pipeline for Rails
 gem "stimulus-rails", '~> 1.3.4'                                    # Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev]
 gem "thruster", '~> 0.1.12', require: false                         # Add HTTP asset caching/compression and X-Sendfile acceleration to Puma [https://github.com/basecamp/thruster/]

Gemfile.lock

@@ -400,10 +400,9 @@ GEM
       fugit (~> 1.11.0)
       railties (>= 7.1)
       thor (~> 1.3.1)
-    sprockets (3.7.5)
-      base64
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     sprockets-rails (3.5.2)
       actionpack (>= 6.1)
       activesupport (>= 6.1)
@@ -483,7 +482,7 @@ DEPENDENCIES
   solid_cable (~> 3.0.7)
   solid_cache (~> 1.0.7)
   solid_queue (~> 1.1.4)
-  sprockets (= 3.7.5)
+  sprockets (= 4.2.1)
   sprockets-rails (~> 3.5.2)
   stimulus-rails (~> 1.3.4)
   thruster (~> 0.1.12)