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Haystack 2.1.1

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⚡️ Enhancement Notes

Make SparseEmbedding a dataclass, this makes it easier to use the class with Pydantic

🐛 Bug Fixes

Fix the broken serialization of HuggingFaceAPITextEmbedder, HuggingFaceAPIDocumentEmbedder, HuggingFaceAPIGenerator, and HuggingFaceAPIChatGenerator.
Add to_dict method to DocumentRecallEvaluator to allow proper serialization of the component.