remove unused dependencies from test CI step

.github/workflows/ci.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Install dependencies
         shell: bash -l {0}
         run: |
-          python -m pip install flake8 pytest parameterized nbmake
+          python -m pip install nbmake
           python -m pip install ".[dev,docs,test]"
       - name: Test with pytest
         shell: bash -l {0}