fix authentication when publishing release assets

Author: duncanpo

.github/workflows/publish_mltbx.yml

@@ -127,8 +127,10 @@ jobs:
               run: zip otel-matlab-${{ github.event.release.tag_name }}.mltbx.zip otel-matlab.mltbx
             - name: Upload Release Asset
               uses: actions/upload-release-asset@v1
+              env:
+                GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
               with: 
-                upload_url: https://uploads.github.com/repos/mathworks/OpenTelemetry-Matlab/releases/${{ github.event.release.id }}/assets{?name,label}`
+                upload_url: ${{ github.event.release.upload_url }}
                 asset_path: ./otel-matlab-${{ github.event.release.tag_name }}.mltbx.zip
                 asset_name: otel-matlab-${{ github.event.release.tag_name }}.mltbx.zip
                 asset_content_type: application/zip