Prepare release for Solidus v4.4.0

[github-actions]

This code has been automatically generated by our 'Prepare release' GitHub
action.

The actual release is not part of the automation, and it still needs to be manually done by a maintainer.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.54%. Comparing base (a89b955) to head (52a57a5).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../solidus/install/app_templates/frontend/starter.rb	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5910   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files         783      783           
  Lines       17994    17994           
=======================================
  Hits        16113    16113           
  Misses       1881     1881           

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