fix(snowflake): set con outside of _setup_session call (#8979)

Fixes the failing Snowflake tests in CI.

ibis/backends/snowflake/__init__.py

@@ -216,8 +216,8 @@ def do_connect(self, create_object_udfs: bool = True, **kwargs: Any):
         connect_args = kwargs.copy()
         session_parameters = connect_args.pop("session_parameters", {})
 
+        self.con = sc.connect(**connect_args)
         self._setup_session(
-            con=sc.connect(**connect_args),
             session_parameters=session_parameters,
             create_object_udfs=create_object_udfs,
         )