fix: upgrade upload-artifact to v4.6.2 for better artifact support

Upgraded from v3.2.1-node20 to v4.6.2 to fix artifact upload failures.
The v3 version had stricter naming requirements and compatibility issues.

Changes:
- actions/upload-artifact: v3.2.1-node20 → v4.6.2
- SHA: c24449f → ea165f8 (verified)

v4 provides better artifact naming support and improved reliability.

Author: eabdelmoneim

.github/workflows/build.yml

@@ -87,7 +87,7 @@ jobs:
           echo "- \`build/index.tsx.asset.php\`" >> $GITHUB_STEP_SUMMARY
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@c24449f33cd45d4826c6702db7e49f7cdb9b551d # v3.2.1-node20
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: build-artifacts
           path: build/