Fix typo in publish pipeline

Author: devlato

.github/workflows/release.yml

@@ -175,7 +175,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [lint, test_and_report_coverage, build_code, build_docs, integration_tests, changelog]
     outputs:
-      tag_name: '${{ steps.tagging.outputs.tagname }}'
+      tagname: '${{ steps.tagging.outputs.tagname }}'
     steps:
       - name: Checkout
         uses: actions/checkout@v4