Log Message:
misc/ruby-sprockets: update to 4.2.1

4.2.1 (2023-09-05)

What's Changed

* Fix .jpeg precompile issue by @ghiculescu in #781
* CI against Ruby 3.2 [changelog skip] by @amatsuda in #777
* Fix header casing compatibility with Rails 7 by @skipkayhil in #790
* fix: set application/css-sourcemap+json default charset to unicode by
  @chadlwilson in #764

New Contributors

* @ghiculescu made their first contribution in #781
* @skipkayhil made their first contribution in #791
* @jpbalarini made their first contribution in #768
* @chadlwilson made their first contribution in #764