allow release updates

Author: drdrew42

.github/workflows/generate-opl-release.yml

@@ -56,6 +56,7 @@ jobs:
       - name: Publish METADATA Release
         uses: "ncipollo/release-action@v1"
         with:
+          allowUpdates: true
           token: "${{ secrets.GITHUB_TOKEN }}"
           artifacts: "webwork-open-problem-library-METADATA.tar.gz,\
                       webwork-open-problem-library-METADATA.tar.bz2,\