use local poetry.lock on CI for testing

Author: twoertwein

.github/workflows/test.yml

@@ -28,12 +28,6 @@ jobs:
       run: echo "::set-output name=VERSION::$(poetry --version)"
       id: poetry_version
 
-    - name: Cache poetry.lock
-      uses: actions/cache@v3
-      with:
-        path: poetry.lock
-        key: ${{ matrix.os }}-${{ matrix.python-version }}-poetry-${{ steps.poetry_version.outputs.VERSION }}-${{ hashFiles('pyproject.toml') }}
-
     - name: Install project dependencies
       run: poetry install -vvv --no-root