Update `langchain*` packages

[nicola-corbellini]

The following packages should be updated:

"langchain==0.2.1",
"langchain-community==0.2.1",
"langchain-openai==0.1.7",
"langchain-google-genai==1.0.8",
"langchain-cohere==0.1.5"

If I've understood correctly, not a priority before V2

[valentimarco]

we should see the bind_tools function for those that can support function calling. I have a branch with a simple try catch