fix ci deps

.github/workflows/main.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Install dependencies & self
       run: |
         python -m pip install --upgrade pip
-        pip install .[test,parallel]
+        pip install .[test,parallel,neuron,arbor]
         pip install NEURON==${{ matrix.nrn }}
     - name: Run package-free tests
       run: coverage run -p -m unittest -v