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_endpoint.py

@@ -2,7 +2,7 @@ import json
 from typing import Any, Dict, List, Optional
 
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
+from langchain_core.pydantic_v1 import BaseModel, root_validator
 from langchain_core.utils import get_from_dict_or_env
 
 DEFAULT_MODEL = "sentence-transformers/all-mpnet-base-v2"
@@ -44,7 +44,7 @@ class HuggingFaceEndpointEmbeddings(BaseModel, Embeddings):
     class Config:
         """Configuration for this pydantic object."""
 
-        extra = Extra.forbid
+        extra = "forbid"
 
     @root_validator(pre=False, skip_on_failure=True)
     def validate_environment(cls, values: Dict) -> Dict: