Bump sprockets from 4.1.1 to 4.2.0

Bumps [sprockets](https://github.com/rails/sprockets) from 4.1.1 to 4.2.0.
- [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/v4.1.1...v4.2.0)

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

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

Gemfile

@@ -56,7 +56,7 @@ gem "sassc-rails", "~> 2.1.2"
 gem "savon", "~> 2.14.0"
 gem "sitemap_generator", "~> 6.3.0"
 gem "social-share-button", "~> 1.2.4"
-gem "sprockets", "~> 4.1.1"
+gem "sprockets", "~> 4.2.0"
 gem "turbolinks", "~> 5.2.1"
 gem "turnout", "~> 2.5.0"
 gem "uglifier", "~> 4.2.0"

Gemfile.lock

@@ -597,9 +597,9 @@ GEM
     spring (2.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (4.1.1)
+    sprockets (4.2.0)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     sprockets-es6 (0.9.2)
       babel-source (>= 5.8.11)
       babel-transpiler
@@ -760,7 +760,7 @@ DEPENDENCIES
   social-share-button (~> 1.2.4)
   spring (~> 2.1.1)
   spring-commands-rspec (~> 1.0.4)
-  sprockets (~> 4.1.1)
+  sprockets (~> 4.2.0)
   turbolinks (~> 5.2.1)
   turnout (~> 2.5.0)
   uglifier (~> 4.2.0)