Update python-package.yml

Using `pip install .` instead of `python -m build`

.github/workflows/python-package.yml

@@ -26,10 +26,10 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest build
+        pip install pytest
     - name: Install Package
       run: |
-        python -m build
+        python -m pip install .
     - name: Test with pytest
       run: |
         pytest tests