Revert "Upgrade twine, check the version"

This reverts commit f09ac56.

Author: Pierre-Sassoulas

.github/workflows/main.yml

@@ -19,11 +19,9 @@ jobs:
         run: >-
           python3 -m pip install --user
           build
-          twine --upgrade
+          twine
       - 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