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 95.47%. Comparing base (8fe6577) to head (92394f0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3042   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files        1386     1386           
  Lines       32665    32665           
  Branches     7483     7493   +10     
=======================================
  Hits        31188    31188           
  Misses       1408     1408           
  Partials       69       69           

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