combine pip install

Author: crccheck

.github/workflows/ci.yml

@@ -43,8 +43,7 @@ jobs:
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ matrix.django-version }}
           restore-keys: |
             ${{ runner.os }}-pip-
-      - run: pip install -e '.[dev]'
-      - run: pip install "Django==${{ matrix.django-version }}.*"
+      - run: pip install -e '.[dev]' "Django==${{ matrix.django-version }}.*"
       - run: make test
 
   lint: