Bump sprockets from 3.7.2 to 4.0.3 in /docs

Bumps [sprockets](https://github.com/rails/sprockets) from 3.7.2 to 4.0.3.
- [Release notes](https://github.com/rails/sprockets/releases)
- [Changelog](https://github.com/rails/sprockets/blob/main/CHANGELOG.md)
- [Commits](rails/sprockets@v3.7.2...v4.0.3)

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

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

Author: dependabot[bot]

docs/Gemfile

@@ -27,7 +27,7 @@ end
 
 # Performance-booster for watching directories on Windows
 gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
-gem "sprockets", "~> 3.7.2"
+gem "sprockets", "~> 4.0.3"
 
 # Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
 # do not have a Java counterpart.

docs/Gemfile.lock

@@ -263,7 +263,7 @@ GEM
       faraday (>= 0.17.3, < 3)
     simpleidn (0.2.1)
       unf (~> 0.1.4)
-    sprockets (3.7.2)
+    sprockets (4.0.3)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     terminal-table (1.8.0)
@@ -287,7 +287,7 @@ DEPENDENCIES
   jekyll-assets (~> 3.0.12)
   jekyll-feed (~> 0.12)
   jekyll-toc (~> 0.17)
-  sprockets (~> 3.7.2)
+  sprockets (~> 4.0.3)
   tzinfo (~> 1.2)
   tzinfo-data
   wdm (~> 0.1.1)