Fixes to python client upload part

.gitea/workflows/build_and_test.yml

@@ -71,7 +71,7 @@ jobs:
           TWINE_USERNAME: "__token__"  # Username for Twine when using token-based auth
           TWINE_PASSWORD: ${{ secrets.PIP_REPOSITORY_API_TOKEN }}  # Use the secret for authentication
         run: |
-          python -m venv .twine
+          python3 -m venv .twine
           source .twine/bin/activate
           pip3 install twine
           twine upload --repository-url https://gitea.psi.ch/api/packages/mx/pypi dist/*