ENH: Install typing-extensions package

Author: Lee Newberg

.github/workflows/build-test-package.yml

@@ -36,7 +36,7 @@ jobs:
           sudo apt update
           sudo apt install openslide-tools python3-openslide
           python -m pip install --upgrade pip setuptools wheel
-          pip install 'flake8${{ matrix.flake8-python-git-tag }}' 'pooch${{ matrix.pooch-python-git-tag }}' 'pytest${{ matrix.pytest-python-git-tag }}'
+          pip install 'flake8${{ matrix.flake8-python-git-tag }}' 'pooch${{ matrix.pooch-python-git-tag }}' 'pytest${{ matrix.pytest-python-git-tag }}' 'typing-extensions'
           pip install 'large-image[bioformats,ometiff,openjpeg,openslide,tiff]' 'scikit_image' --find-links https://girder.github.io/large_image_wheels
 
       - name: Install histomics_stream