Poetry add only lock

Author: earthpyy

.github/workflows/ci.yaml

@@ -66,9 +66,9 @@ jobs:
           poetry-version: "1.1.11"
       - name: Install dependencies
         run: |
+          poetry add -n --lock django@^${{ matrix.django }}.0
+          poetry add -n --lock djangorestframework@^${{ matrix.django-rest }}.0
           poetry install -n
-          poetry add -n django@^${{ matrix.django }}.0
-          poetry add -n djangorestframework@^${{ matrix.django-rest }}.0
       - name: Test with pytest
         env:
           DJANGO_SETTINGS_MODULE: tests.settings