use pip for ngist install and remove numpy reinstall

.github/workflows/test_build_mac.yaml

@@ -23,17 +23,18 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install numpy astropy PyQt6 scipy matplotlib pytest multiprocess latex spectral_cube extinction h5py joblib
-          # force reinstall of numpy due to v2.0.0 not working properly with other packages
-          pip install --force-reinstall -v "numpy==1.26.4"          
-
+          pip install numpy astropy PyQt6 scipy matplotlib pytest latex spectral_cube extinction h5py joblib
+          # force reinstall of numpy due to v2.0.0 not working properly with other packages --> no longer an issue?
+          # pip install --force-reinstall "numpy==1.26.4"
+          
           #python setup.py install
           # python -m pip install --upgrade pip
           # pip install flake8 pytest
           # if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Install ngist
         run: |
-          python setup.py install
+          # python setup.py install
+          pip install .
       # - name : Lint with flake8
         # run: |
           # stop the build if there are Python syntax errors or undefined names