moved black to linting job

.github/workflows/lint-and-test.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8
+          pip install flake8 black
 
       - name: Lint with flake8
         run: |
@@ -49,7 +49,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -q Django==${{ matrix.django_version }}
-        pip install coverage black
+        pip install coverage
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 
     - name: Run tests