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/anthropic/tests/unit_tests/test_standard.py

@@ -7,6 +7,8 @@ from pytest_benchmark.fixture import BenchmarkFixture  # type: ignore[import-unt
 
 from langchain_anthropic import ChatAnthropic
 
+_MODEL = "claude-3-haiku-20240307"
+
 
 class TestAnthropicStandard(ChatModelUnitTests):
     """Use the standard chat model unit tests against the `ChatAnthropic` class."""
@@ -17,7 +19,15 @@ class TestAnthropicStandard(ChatModelUnitTests):
 
     @property
     def chat_model_params(self) -> dict:
-        return {"model": "claude-3-haiku-20240307"}
+        return {"model": _MODEL}
+
+    @property
+    def init_from_env_params(self) -> tuple[dict, dict, dict]:
+        return (
+            {"ANTHROPIC_API_KEY": "test"},
+            {"model": _MODEL},
+            {"anthropic_api_key": "test"},
+        )
 
 
 @pytest.mark.benchmark