Remove conda-forge from ci/cd

Author: christopher-wild

.github/workflows/ci-tests.yaml

@@ -22,7 +22,6 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install package and dependencies
         run: |
-          conda install -c conda-forge pygraphviz
           python --version
           pip install -e . --no-cache-dir
           pip install -e .[test]