Fix lock file action to work with artifacts v4

[trexfeathers]

🚀 Pull Request

Description

Not sure why I didn't think of this the first time round. Explains this failure. Xref #493

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.37%. Comparing base (589eac5) to head (fd0790b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #499   +/-   ##
=======================================
  Coverage   90.37%   90.37%           
=======================================
  Files           6        6           
  Lines         800      800           
  Branches      105      105           
=======================================
  Hits          723      723           
  Misses         64       64           
  Partials       13       13           

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