test(backend): switch to django test runner

requirements/dev.txt

@@ -7,10 +7,9 @@ ipython>=8.25
 # Debug toolbar
 django-debug-toolbar>=4.4
 
-# Testing
-pytest>=8.2
-pytest-django>=4.8
-factory-boy>=3.3
+# Testing
+coverage>=7.10
+factory-boy>=3.3
 
 # Linting & formatting
 black>=24.4
@@ -22,4 +21,4 @@ django-stubs>=5.0
 
 # Pre-commit hooks
 pre-commit>=3.7
-commitizen>=4.13
+commitizen>=4.13