CI: merge two install steps (#15776)

.github/workflows/ci-app-tests.yml

@@ -77,16 +77,11 @@ jobs:
       - name: Switch PyTorch URL
         run: python -c "print('TORCH_URL=https://download.pytorch.org/whl/' + str('test/cpu/torch_test.html' if '${{matrix.release}}' == 'pre' else 'cpu/torch_stable.html'))" >> $GITHUB_ENV
 
-      - name: Install package
+      - name: Install package & depenencies
         env:
           PACKAGE_NAME: ${{ matrix.pkg-name }}
         run: |
-          pip install -e . pytest --upgrade --find-links ${TORCH_URL}
-          pip list
-
-      - name: Install dependencies
-        run: |
-          pip install -r requirements/app/devel.txt --quiet --find-links ${TORCH_URL}
+          pip install -e . -r requirements/app/devel.txt -U -q --find-links ${TORCH_URL}
           pip list
 
       - name: Setup Node.js