langchain langchain-anthropic==1.7.1

Changes since langchain==1.3.18 docs(langchain): runnable examples (#39976) feat(langchain): namespace, (#39939) perf(anthropic,langchain): omit middleware trace inputs (#40098) fix(langchain): include model destination in agent tool routing (#38355) chore(langchain): bump vcrpy test dependency minimum to (#39942)