non-conditional on requirements.

.github/workflows/testing-windows.yml

@@ -28,7 +28,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -e .[dev]
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install -r requirements.txt
     - name: Run unit tests with pytest
       run: |
         python -m pytest tests