Fix dependencies for coverage step

.github/workflows/django.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install Dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pycodestyle coverage
+          pip install pycodestyle
           pip install -r requirements.txt
           python manage.py collectstatic --noinput
       - name: Basic Checks
@@ -45,10 +45,13 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
+    container: python:3-slim
     needs: build
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
+      - name: Install Dependencies
+        run: pip install coverage coveralls
       - name: Run Tests
         run: coverage run python manage.py test --verbosity=2
       - name: Upload coverage data to coveralls.io

requirements.txt

@@ -8,8 +8,6 @@ certifi==2020.6.20
 chardet==3.0.4
 configparser==5.0.1
 contextlib2==0.6.0.post1
-coverage==5.3
-coveralls==3.0.0
 cssselect==1.1.0
 cssutils==1.0.2
 diff-match-patch==20200713