Install Windows dependencies in GH Actions

.github/workflows/testing.yml

@@ -17,18 +17,12 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: ubuntu-latest
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        exclude:
+        include:
           # only test with Python 3.10 on Windows
           - os: windows-latest
-            python-version: "3.8"
-          - os: windows-latest
-            python-version: "3.9"
-          - os: windows-latest
-            python-version: "3.11"
-          - os: windows-latest
-            python-version: "3.12"
+            python-version: "3.10"
 
     steps:
     - uses: actions/checkout@v4
@@ -40,6 +34,12 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install -r dev-requirements.txt
+
+    - name: Install Windows specific dependencies
+      if: runner.os == 'Windows'
+      run: |
+        python -m pip install -r win-requirements.txt
+
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names