Install napari and pyqt with pip for GUI tests in CI

.github/workflows/test.yaml

@@ -34,19 +34,22 @@ jobs:
       # Setup Qt libraries for GUI testing
       - uses: tlambert03/setup-qt-libs@v1
 
+      - name: Install napari and pyqt for GUI tests
+        shell: bash -l {0}
+        run: pip install "napari[all]"
+
       - name: Install pytest
         shell: bash -l {0}
         run: |
           python -m pip install pytest
           python -m pip install pytest-cov
+          python -m pip install pytest-qt
 
       - name: Install package
         uses: aganders3/headless-gui@v1
         with:
           shell: bash -l {0}
-          run: |
-            mamba install napari pyqt -c conda-forge
-            pip install --no-deps -e .
+          run: pip install --no-deps -e .
 
       - name: Run tests
         shell: bash -l {0}