Fix Scenario import path for policyengine_uk

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vahid-ahmadi

src/scottish_budget_data/reforms.py

@@ -20,15 +20,15 @@ class Reform:
 
     def to_scenario(self):
         """Convert to PolicyEngine Scenario."""
-        from policyengine_uk import Scenario
+        from policyengine_uk.utils.scenario import Scenario
 
         if not self.parameter_changes:
             return None
         return Scenario(parameter_changes=self.parameter_changes)
 
     def to_baseline_scenario(self):
         """Convert baseline changes to PolicyEngine Scenario."""
-        from policyengine_uk import Scenario
+        from policyengine_uk.utils.scenario import Scenario
 
         if not self.baseline_parameter_changes:
             return None