fix: Prepares for IPooledEnumerable removal (#1548)

### Summary

- Removes `IPooledEnumerable` (non-generic)
- Changes `IPooledEnumerable<T>` so that  `Free()` is replaced with the `IDisposable` pattern

Projects/UOContent/Spells/Spellweaving/EssenceOfWind.cs

@@ -63,8 +63,6 @@ namespace Server.Spells.Spellweaving
                         new BuffInfo(BuffIcon.EssenceOfWind, 1075802, duration, m, $"{fcMalus}\t{ssiMalus}")
                     );
                 }
-
-                eable.Free();
             }
 
             FinishSequence();