add electricity consumption zurich dataset to repository (#2862)

Author: dennisbader

CHANGELOG.md

@@ -35,6 +35,7 @@ but cannot always guarantee backwards compatibility. Changes that may **break co
 - Renamed `RegressionModelWithCategoricalCovariates` to `RegressionModelWithCategoricalFeatures` which now also supports categorical target features. [#2765](https://github.com/unit8co/darts/pull/2765) by [Jonas Blanc](https://github.com/jonasblanc)
 - Added `MultiOutputClassifier` for handling multi-output classification tasks. [#2765](https://github.com/unit8co/darts/pull/2765) by [Jonas Blanc](https://github.com/jonasblanc)
 - Cleaned up `Dockerfile` to only include the necessary files for building the Darts package. [#2854](https://github.com/unit8co/darts/pull/2854) by [Dennis Bader](https://github.com/dennisbader).
+- Added `ElectricityConsumptionZurichDataset` to the repository instead of downloading it from source to fix failing tests due to continuously updating source data. [#2862](https://github.com/unit8co/darts/pull/2862) by [Dennis Bader](https://github.com/dennisbader).
 
 ## [0.36.0](https://github.com/unit8co/darts/tree/0.36.0) (2025-06-29)