Fix card cycles release date calculation

[plural]

This now properly calculates cycle release date as the minimum date_release for the packs in the set.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (9476391) to head (cf39993).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #376   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          81       81           
  Lines        1384     1384           
  Branches      183      183           
=======================================
  Hits         1360     1360           
  Misses         24       24           

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