chore: Bump transformers (#9740)

* Bump transformers

* Fix typing issue

* Pin transformers to less than 5

Author: sjrl

haystack/components/routers/transformers_text_router.py

@@ -133,12 +133,14 @@ def warm_up(self):
             self.pipeline = pipeline(**self.huggingface_pipeline_kwargs)
 
         # Verify labels from the model configuration file match provided labels
-        labels = set(self.pipeline.model.config.label2id.keys())
-        if set(self.labels) != labels:
-            raise ValueError(
-                f"The provided labels do not match the labels in the model configuration file. "
-                f"Provided labels: {self.labels}. Model labels: {labels}"
-            )
+        label2id = self.pipeline.model.config.label2id
+        if label2id is not None:
+            labels = set(label2id.keys())
+            if set(self.labels) != labels:
+                raise ValueError(
+                    f"The provided labels do not match the labels in the model configuration file. "
+                    f"Provided labels: {self.labels}. Model labels: {labels}"
+                )
 
     def to_dict(self) -> dict[str, Any]:
         """

pyproject.toml

@@ -90,7 +90,7 @@ dependencies = [
   "pandas",                                           # AzureOCRDocumentConverter, CSVDocumentCleaner, CSVDocumentSplitter,
                                                       # EvaluationRunResult, XLSXToDocument, and pipeline tests
 
-  "transformers[torch, sentencepiece]>=4.52.4,<4.53", # ExtractiveReader, TransformersSimilarityRanker, LocalWhisperTranscriber, HFGenerators...
+  "transformers[torch, sentencepiece]>=4.55.4,<5.0",  # ExtractiveReader, TransformersSimilarityRanker, LocalWhisperTranscriber, HFGenerators...
   "huggingface_hub>=0.27.0",                          # Hugging Face API Generators and Embedders
   "sentence-transformers>=4.1.0",                     # Sentence Transformers Embedders, Rankers, and SASEvaluator
   "langdetect",                                       # TextLanguageRouter and DocumentLanguageClassifier