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 94.64%. Comparing base (a103780) to head (2e801d9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #866   +/-   ##
=======================================
  Coverage   94.64%   94.64%           
=======================================
  Files         164      164           
  Lines        3623     3623           
  Branches      998      993    -5     
=======================================
  Hits         3429     3429           
  Misses        181      181           
  Partials       13       13           

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