templates: migrate to langchain_anthropic package to support Claude 3 models (#19393)

- **Description:** update langchain anthropic templates to support
Claude 3 (iterative search, chain of note, summarization, and XML
response)
- **Issue:** issue # N/A. Stability issues and errors encountered when
trying to use older langchain and anthropic libraries.
- **Dependencies:**
  - langchain_anthropic version 0.1.4\
- anthropic package version in the range ">=0.17.0,<1" to support
langchain_anthropic.
- **Twitter handle:** @d_w_b7


- [ x]**Add tests and docs**: If you're adding a new integration, please
include
  1. used instructions in the README for testing

- [ x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

Additional guidelines:
- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to pyproject.toml files (even optional
ones) unless they are required for unit tests.
- Most PRs should not touch more than one package.
- Changes should be backwards compatible.
- If you are adding something to community, do not re-import it in
langchain.

If no one reviews your PR within a few days, please @-mention one of
baskaryan, efriis, eyurtsev, hwchase17.

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Erick Friis <erick@langchain.dev>

templates/xml-agent/xml_agent/agent.py

@@ -4,7 +4,7 @@ from langchain.agents import AgentExecutor
 from langchain.agents.format_scratchpad import format_xml
 from langchain.tools import DuckDuckGoSearchRun
 from langchain.tools.render import render_text_description
-from langchain_community.chat_models import ChatAnthropic
+from langchain_anthropic import ChatAnthropic
 from langchain_core.messages import AIMessage, HumanMessage
 from langchain_core.pydantic_v1 import BaseModel, Field
 
@@ -19,7 +19,7 @@ def _format_chat_history(chat_history: List[Tuple[str, str]]):
     return buffer
 
 
-model = ChatAnthropic(model="claude-2")
+model = ChatAnthropic(model="claude-3-sonnet-20240229")
 
 tools = [DuckDuckGoSearchRun()]