refactor: Update CohereEmbeddingsComponent to use type hinting for CohereEmbeddings return value

src/backend/base/langflow/components/embeddings/CohereEmbeddings.py

@@ -34,7 +34,7 @@ class CohereEmbeddingsComponent(LCModelComponent):
     ]
 
     def build_embeddings(self) -> Embeddings:
-        return CohereEmbeddings(
+        return CohereEmbeddings(  # type: ignore
             cohere_api_key=self.cohere_api_key,
             model=self.model,
             truncate=self.truncate,