Change Django branch for CI testing.

Author: WaVEV

.github/workflows/test-python.yml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: 'wavev/django'
-          ref: 'add-support-for-GenericForeignKey-and-GenericRelation'
+          ref: 'add-support-join-extra-conditions'
           path: 'django_repo'
       - name: Install system packages for Django's Python test dependencies
         run: |