Update pythonpackage.yml

.github/workflows/pythonpackage.yml

@@ -31,11 +31,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
-
-    - uses: actions/cache@v2
-      with:
-        path: ${{ env.pythonLocation }}
-        key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('requirements.txt') }}-${{ hashFiles('requirements-test.txt') }}
+        cache: 'pip'
         
     - name: Install psycopg2 prerequisites
       run: sudo apt-get install libpq-dev