fix: makefile build.requirements target had conditional in wrong place

[matt-codecov]

whoops. don't know why this worked when i merged initially, i guess it might have used the cached reqs image...?

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.32%. Comparing base (6bb21bf) to head (117b9b9).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1281   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files         487      487           
  Lines       16907    16907           
=======================================
  Hits        16285    16285           
  Misses        622      622           

Flag	Coverage Δ
unit	96.32% <ø> (ø)

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