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.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.29%. Comparing base (a29f517) to head (47b90f0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #278   +/-   ##
=======================================
  Coverage   84.29%   84.29%           
=======================================
  Files          50       50           
  Lines         707      707           
  Branches      134      134           
=======================================
  Hits          596      596           
  Misses        111      111           

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