Sample builder: dissociate macos artifacts

Author: howetuft

.github/workflows/sample-builder.yml

@@ -323,7 +323,7 @@ jobs:
       - uses: actions/upload-artifact@v4
         id: upload
         with:
-          name: LuxCore-${{ runner.os }}
+          name: LuxCore-${{ runner.os }}-${{ runner.arch }}
           path: ${{ github.workspace }}/out/build/LuxCore-*.zip
 
   attest-samples: