langchain-openai==1.6.1

Changes since langchain-openai==1.6.0

fix(openai): bump max_completion_tokens in cache breakpoint integration test (#40284)
release(openai): 1.6.1 (#40268)
chore(model-profiles): refresh model profile data (#40217)
fix(openai): support Azure AD auth with OpenAI 3.8 (#40190)
feat(openai): support async tools (#40208)
feat(openai): support configuration_update (#40201)
chore(model-profiles): refresh model profile data (#40171)
fix(openai): route gpt-5.6-sol to responses API (#40133)
chore(openai): fix tests (#39972)
fix(openai): correct reasoning_effort_levels for gpt-5 and gpt-5.1 profiles (#39936)
chore(model-profiles): refresh model profile data (#39954)