Update dotnetcore.yml

Author: mcasperson

.github/workflows/dotnetcore.yml

@@ -93,7 +93,7 @@ jobs:
         joinednewline="${joinednewline//$'\n'/'%0A'}"
         joinednewline="${joinednewline//$'\r'/'%0D'}"
         # Save the list of packages newline separated as an output variable
-        echo "::set-output name=artifacts_new_line::${joinedNewLine%\n}"
+        echo "::set-output name=artifacts_new_line::${joinednewline%\n}"
     - run: 'echo "The string is: ${{ steps.package.outputs.artifacts_new_line }}"'
       shell: bash
     - name: Create Release