[CI] use pip instead of setuptools

Author: peterjc123

.github/workflows/full-test.yml

@@ -62,7 +62,7 @@ jobs:
             fi
          fi
       - name: Install TinyNeuralNetwork
-        run: python setup.py install
+        run: pip install .
       - name: Install test dependencies
         env:
           PYTORCH_VER: ${{ matrix.vers.pt_ver }}

.github/workflows/smoke-test.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install PyTorch
         run: conda install pytorch torchvision -c pytorch
       - name: Install TinyNeuralNetwork
-        run: python setup.py install
+        run: pip install .
       - name: Basic imports
         run: |
           cd tests