remove nbdime for now

Author: Carreau

.github/workflows/main.yml

@@ -36,12 +36,7 @@ jobs:
     - name: Install package with test dependencies
       run: pip install .[test]
 
-    - name: Test installation with nbdime
-      if: ${{ matrix.python-version != '3.9' }}
-      run: pytest -v --nbdime
-
     - name: Test installation without nbdime
-      if: ${{ matrix.python-version == '3.9' }}
       run: pytest -v
 
     - name: Test flake8