chore: Remove Django 2.2-specific DRF install, and clean up coverage report

Author: sondrelg

.github/workflows/testing.yml

@@ -54,17 +54,16 @@ jobs:
         id: poetry-cache
         with:
           path: ~/.local
-          key: key-1
+          key: key-3
       - name: Install poetry
         uses: snok/install-poetry@v1
         with:
-          version: 1.2.0a2
           virtualenvs-create: false
       - uses: actions/cache@v2
         id: cache-venv
         with:
           path: .venv
-          key: ${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}-1
+          key: ${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}-2
       - run: |
           pip install virtualenv
           virtualenv .venv
@@ -76,23 +75,16 @@ jobs:
         run: |
           source .venv/bin/activate
           pip install "Django==${{ matrix.django-version }}"
-      - run: |
-          source .venv/bin/activate
-          pip install coverage[toml]
-      - name: Install DRF 3.11 on Django 2.2
-        if: matrix.django-version == '2.2'
-        run: pip install "djangorestframework==3.11.1"
       - name: Run tests
         run: |
           source .venv/bin/activate
-          poetry run pytest --cov=. --cov-report=xml
-          poetry run coverage report
+          pytest --cov=. --cov-report xml --cov-report term-missing
       - name: Archive coverage
         uses: actions/upload-artifact@v2
         with:
           name: coverage-xml
           path: coverage.xml
-        if: matrix.python-version == '3.10' && matrix.django-version == '3.2'
+        if: matrix.python-version == '3.10' && matrix.django-version == '4.0'
   coverage:
     needs: test
     runs-on: ubuntu-latest