fix(core): serialization patch (#34455)

- `allowed_objects` kwarg in `load`
- escape lc-ser formatted dicts on `dump`
- fix for jinja2

---------

Co-authored-by: Mason Daugherty <github@mdrxy.com>

libs/partners/groq/tests/unit_tests/test_chat_models.py

@@ -274,6 +274,7 @@ def test_groq_serialization() -> None:
         dump,
         valid_namespaces=["langchain_groq"],
         secrets_map={"GROQ_API_KEY": api_key2},
+        allowed_objects="all",
     )
 
     assert type(llm2) is ChatGroq