Include solidus_legacy_promotions in release task

[mamhoff]

Not sure how we missed that when including solidus_promotions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.54%. Comparing base (825fb6d) to head (6c8e842).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5941   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files         782      782           
  Lines       17991    17991           
=======================================
  Hits        16110    16110           
  Misses       1881     1881           

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[github-actions]

💚 All backports created successfully

Status	Branch	Result
✅	v4.4

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