chore: downgrade @openedx/brand-openedx to ^1.2.3 (#124)

Reverts the v2 bump from openedx/public-engineering#505 while keeping
the existing @edx/brand npm alias. Refs openedx/public-engineering#508.

Author: arbrandes

package-lock.json

@@ -32,7 +32,7 @@
     "url": "https://github.com/openedx/frontend-app-catalog/issues"
   },
   "dependencies": {
-    "@edx/brand": "npm:@openedx/brand-openedx@^2.0.0",
+    "@edx/brand": "npm:@openedx/brand-openedx@^1.2.3",
     "@edx/frontend-component-footer": "^14.7.1",
     "@edx/frontend-component-header": "^8.0.0",
     "@edx/frontend-platform": "^8.7.0",