chore: downgrade @openedx/brand-openedx to ^1.2.3

[arbrandes]

Description

Reverts the @openedx/brand-openedx v2 bump landed via openedx/public-engineering#505. The package is downgraded to the latest 1.x release (^1.2.3) while preserving the existing @edx/brand -> @openedx/brand-openedx npm alias. The frontend-build and frontend-platform bumps from #505 are unaffected.

Tracked by openedx/public-engineering#508.

LLM usage notice

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.17%. Comparing base (cea4c53) to head (c1bc076).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1347   +/-   ##
=======================================
  Coverage   81.17%   81.17%           
=======================================
  Files          51       51           
  Lines         834      834           
  Branches      242      232   -10     
=======================================
  Hits          677      677           
  Misses        150      150           
  Partials        7        7           

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