CI: Remove unnecessary pipx call

Author: effigies

.github/workflows/test.yml

@@ -149,7 +149,7 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install tox tox-gh-actions
       - name: Show tox config
-        run: pipx run tox c
+        run: tox c
       - name: Run tox
         run: tox -v --exit-and-dump-after 1200
       - uses: codecov/codecov-action@v3