Remove obsolete parts

Author: fabaff

.github/workflows/python-package.yml

@@ -24,24 +24,6 @@ jobs:
     - name: Install Poetry
       uses: Gr1N/setup-poetry@v7
 
-    - name: Cache Poetry virtualenv
-      uses: actions/cache@v1
-      id: cache
-      with:
-        path: ~/.virtualenvs
-        key: poetry-${{ hashFiles('**/poetry.lock') }}
-        restore-keys: |
-          poetry-${{ hashFiles('**/poetry.lock') }}
-
-    - name: Set Poetry config
-      run: |
-        poetry config settings.virtualenvs.in-project false
-        poetry config settings.virtualenvs.path ~/.virtualenvs
-
-    - name: Install Dependencies
-      run: poetry install
-      if: steps.cache.outputs.cache-hit != 'true'
-
     - name: Formatting
       run: poetry run black . --check