Upgrade twine, check the version

Author: Pierre-Sassoulas

.github/workflows/main.yml

@@ -19,9 +19,11 @@ jobs:
         run: >-
           python3 -m pip install --user
           build
-          twine
+          twine --upgrade
       - name: Build a binary wheel and a source tarball
         run: python3 -m build
+      - name: Check the twine version
+        run: twine --version
       - name: Check the distribution files with `twine`
         run: twine check --strict dist/*
       - name: Upload artifact