multiple: pydantic 2 compatibility, v0.3 (#26443)

Signed-off-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Dan O'Donovan <dan.odonovan@gmail.com>
Co-authored-by: Tom Daniel Grande <tomdgrande@gmail.com>
Co-authored-by: Grande <Tom.Daniel.Grande@statsbygg.no>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Tomaz Bratanic <bratanic.tomaz@gmail.com>
Co-authored-by: ZhangShenao <15201440436@163.com>
Co-authored-by: Friso H. Kingma <fhkingma@gmail.com>
Co-authored-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Morgante Pell <morgantep@google.com>

libs/community/tests/unit_tests/embeddings/test_baichuan.py

@@ -1,15 +1,16 @@
 from typing import cast
 
-from langchain_core.pydantic_v1 import SecretStr
+from pydantic import SecretStr
 
 from langchain_community.embeddings import BaichuanTextEmbeddings
 
 
 def test_sparkllm_initialization_by_alias() -> None:
     # Effective initialization
-    embeddings = BaichuanTextEmbeddings(  # type: ignore[call-arg]
+    embeddings = BaichuanTextEmbeddings(
         model="embedding_model",
         api_key="your-api-key",  # type: ignore[arg-type]
+        session=None,
     )
     assert embeddings.model_name == "embedding_model"
     assert (