fix: ipynb execution.txt stacktrace writing issue

.github/workflows/bias-mitigation-automation.yml

@@ -173,7 +173,7 @@ jobs:
            chmod +x ipynb_execution.txt
            
            # Execute the Jupyter notebook and save the output to a new notebook
-           jupyter nbconvert --to notebook --execute ${{ github.workspace }}/examples/${{ github.event.inputs.notebook }} --output ${{ github.workspace }}/automation/${{ github.event.inputs.name }} ipynb_execution.txt 2>&1 || true
+           jupyter nbconvert --to notebook --execute ${{ github.workspace }}/examples/${{ github.event.inputs.notebook }} --output ${{ github.workspace }}/automation/${{ github.event.inputs.name }} > ipynb_execution.txt 2>&1 || true
       
       - name:  📄 Log ipynb execution stack trace
         uses: actions/upload-artifact@v2