fix(deps): update dependency django-ninja to ~=1.4.0

Author: renovate[bot]

backend/pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
     "gunicorn ~= 23.0",
     "uvicorn ~=0.34.0",
     "psycopg[binary] ~= 3.2.1",
-    "django-ninja ~= 1.3.0",
+    "django-ninja ~=1.4.0",
     "httpx ~=0.28.0",
     "cryptography ~=44.0",
     "beautifulsoup4 ~=4.13.3",