Attempting fix for build fail on Windows

.github/workflows/wheels.yml

@@ -22,6 +22,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - uses: actions/setup-python@v5
+        name: Install Python
+        with:
+          python-version: '3.11'
+          architecture: 'x64'
+
       - name: Build wheels
         uses: pypa/[email protected]
 
@@ -40,13 +46,14 @@ jobs:
         name: Install Python
         with:
           python-version: '3.11'
-          architecture: 'x64'
 
       - name: Build sdist
-        run: pipx run build --sdist
+        run: python -m pipx run build --sdist
 
       - name: test install
-        run: pip install dist/magenpy*.tar.gz
+        run: | 
+          python -m pip install --upgrade pip
+          python -m pip install dist/magenpy*.tar.gz
 
       - uses: actions/upload-artifact@v4
         with: