fix(test): Fixes for "TestClient" changes

Seems that client is optional according to the ASGI spec.
https://asgi.readthedocs.io/en/latest/specs/www.html

With Starlette 0.35 the TestClient connection  scope is None for "client".
https://github.com/encode/starlette/pull/2377

Signed-off-by: moson <moson@archlinux.org>

aurweb/users/validate.py

@@ -67,7 +67,7 @@ def invalid_password(
 
 
 def is_banned(request: Request = None, **kwargs) -> None:
-    host = request.client.host
+    host = util.get_client_ip(request)
     exists = db.query(models.Ban, models.Ban.IPAddress == host).exists()
     if db.query(exists).scalar():
         raise ValidationError(