BUG: Install typing-extensions package in GitHub build environment

Author: Lee Newberg

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

@@ -35,7 +35,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install openslide-tools python3-openslide
-          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade pip setuptools wheel 'typing-extensions'
           pip install 'flake8${{ matrix.flake8-python-git-tag }}' 'pooch${{ matrix.pooch-python-git-tag }}' 'pytest${{ matrix.pytest-python-git-tag }}'
           pip install 'large-image[bioformats,ometiff,openjpeg,openslide,tiff]' 'scikit_image' --find-links https://girder.github.io/large_image_wheels