community[patch]: Fix missing protected_namespaces(). (#27610)

- [x] **PR message**:
- **Description:** Fixes warning messages raised due to missing
`protected_namespaces` parameter in `ConfigDict`.
    - **Issue:** https://github.com/langchain-ai/langchain/issues/27609
    - **Dependencies:** No dependencies
    - **Twitter handle:** @gawbul

libs/community/langchain_community/embeddings/google_palm.py

@@ -5,7 +5,7 @@ from typing import Any, Callable, Dict, List, Optional
 
 from langchain_core.embeddings import Embeddings
 from langchain_core.utils import get_from_dict_or_env, pre_init
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 from tenacity import (
     before_sleep_log,
     retry,
@@ -62,6 +62,8 @@ class GooglePalmEmbeddings(BaseModel, Embeddings):
     show_progress_bar: bool = False
     """Whether to show a tqdm progress bar. Must have `tqdm` installed."""
 
+    model_config = ConfigDict(protected_namespaces=())
+
     @pre_init
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate api key, python package exists."""