huggingface[patch], pinecone[patch], fireworks[patch], mistralai[patch], voyageai[patch], togetherai[path]: convert Pydantic extras to literals (#25384)

Backwards compatible change that converts pydantic extras to literals
which is consistent with pydantic 2 usage.

- fireworks
- voyage ai
- mistralai
- mistral ai
- together ai
- huggigng face
- pinecone

libs/partners/huggingface/langchain_huggingface/embeddings/huggingface.py

@@ -1,7 +1,7 @@
 from typing import Any, Dict, List, Optional  # type: ignore[import-not-found]
 
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import BaseModel, Extra, Field
+from langchain_core.pydantic_v1 import BaseModel, Field
 
 DEFAULT_MODEL_NAME = "sentence-transformers/all-mpnet-base-v2"
 
@@ -65,7 +65,7 @@ class HuggingFaceEmbeddings(BaseModel, Embeddings):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.forbid
+        extra = "forbid"
 
     def embed_documents(self, texts: List[str]) -> List[List[float]]:
         """Compute doc embeddings using a HuggingFace transformer model.