added caching of python packages

Author: maximtrp

.github/workflows/package-test.yml

@@ -20,6 +20,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+        cache: 'pip'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip