ci: fix test failure on windows by upgrading pip differently

Author: consideRatio

.github/workflows/test.yaml

@@ -119,7 +119,7 @@ jobs:
           python-version: "${{ matrix.python-version }}"
 
       - name: Update root build packages
-        run: pip install --upgrade pip
+        run: python -m pip install --upgrade pip
 
       - name: Download built artifacts
         uses: actions/download-artifact@v4