Use strict checks for twine

Author: kytta

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
         run: |
           python -m setuptools_scm
           python -m build
-          twine check dist/*
+          twine check --strict dist/*
 
       - name: Upload packages to Jazzband
         if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')