no need to install coverage (it's unused at the moment)

Author: kmike

.github/workflows/tests.yml

@@ -28,7 +28,7 @@ jobs:
           python -VV
           python -m site
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade coverage[toml] virtualenv tox tox-gh-actions
+          python -m pip install --upgrade virtualenv tox tox-gh-actions
           python -m pip install --upgrade cython
 
       - name: "Rebuild CPP files using Cython"