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 100.00%. Comparing base (4ef9318) to head (ea08de5).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #488   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          109       109           
  Lines         1100      1100           
  Branches       163       163           
=========================================
  Hits          1100      1100           

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