Round rack power utilization to nearest 0.1%

Fixes #12838

netbox/dcim/models/racks.py

@@ -466,7 +466,7 @@ class Rack(PrimaryModel, WeightMixin):
             powerport.get_power_draw()['allocated'] for powerport in powerports
         ])
 
-        return int(allocated_draw / available_power_total * 100)
+        return round(allocated_draw / available_power_total * 100, 1)
 
     @cached_property
     def total_weight(self):