Lightend black in the pipline building (#128)

Pipline should now run now 20 -40s faster.

.github/workflows/lint-actions.yaml

@@ -15,14 +15,8 @@ jobs:
         python-version: '3.11'
     - name: Check out Git repository
       uses: actions/checkout@v3
-    - name: Install and configure Poetry
-      uses: snok/install-poetry@v1
-      with:
-        version: 1.4.2
-        virtualenvs-create: false
-        virtualenvs-path: ~/local/share/virtualenvs
-    - run: poetry install --without develop,doc,test
-    - name: Run linters
+    - run: pip install black
+    - name: Run black
       run: |
         black src tests
 
@@ -43,7 +37,7 @@ jobs:
         virtualenvs-create: false
         virtualenvs-path: ~/local/share/virtualenvs
     - run: poetry install --without develop,doc
-    - name: Run linters
+    - name: Run mypy
       run: |
         mypy src tests