fix: update message reload and update langchain-core (#3054)

* refactor: update langchain-core to version 0.2.24

* refactor: convert inner messages to BaseMessage in load_lc_prompt method

* refactor: update ChatPromptTemplate instantiation in message.py

* refactor: update langflow-base dependency to use local path for development

* [autofix.ci] apply automated fixes

* refactor: update ChatPromptTemplate instantiation in message.py

* refactor: add async_from_template_and_variables and sync from_template_and_variables

* feat(tests): add unit test for Message schema serialization and prompt loading

* refactor: update langchain-core dependency to version 0.2.24

* chore: new lock

* mypy

* chore: format pyproject

* refactor: rename async_from_template_and_variables to from_template_and_variables in Message class

* refactor: Rename async_from_template_and_variables to from_template_and_variables in Message class

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Nicolò Boschi <boschi1997@gmail.com>

src/backend/tests/unit/schema/test_schema_message.py

@@ -0,0 +1,30 @@
+import pytest
+from langchain_core.prompts.chat import ChatPromptTemplate
+
+from langflow.schema.message import Message
+
+
+@pytest.fixture
+def client():
+    pass
+
+
+@pytest.mark.asyncio
+async def test_message_async_prompt_serialization():
+    template = "Hello, {name}!"
+    message = await Message.from_template_and_variables(template, name="Langflow")
+    assert message.text == "Hello, Langflow!"
+
+    prompt = message.load_lc_prompt()
+    assert isinstance(prompt, ChatPromptTemplate)
+    assert prompt.messages[0].content == "Hello, Langflow!"
+
+
+def test_message_prompt_serialization():
+    template = "Hello, {name}!"
+    message = Message.sync_from_template_and_variables(template, name="Langflow")
+    assert message.text == "Hello, Langflow!"
+
+    prompt = message.load_lc_prompt()
+    assert isinstance(prompt, ChatPromptTemplate)
+    assert prompt.messages[0].content == "Hello, Langflow!"