fix(anthropic): update integration test models (#32189)

Multiple models were
[retired](https://docs.anthropic.com/en/docs/about-claude/model-deprecations#model-status)
yesterday.

Tests remain broken until we figure out what to do with the legacy
Anthropic LLM integration— currently uses their (legacy) text
completions API, for which there appear to be no remaining supported
models.

Author: ccurme

libs/partners/anthropic/tests/integration_tests/test_experimental.py

@@ -9,8 +9,8 @@
 
 from langchain_anthropic.experimental import ChatAnthropicTools
 
-MODEL_NAME = "claude-3-sonnet-20240229"
-BIG_MODEL_NAME = "claude-3-opus-20240229"
+MODEL_NAME = "claude-3-5-haiku-latest"
+BIG_MODEL_NAME = "claude-opus-4-20250514"
 
 #####################################
 ### Test Basic features, no tools ###