langchain-openai 1.6.3

Changes since langchain-openai==1.6.2

release(openai): 1.6.3 (#40719) fix(openai): expose inferred Responses API routing at initialization (#40715) chore(deps): bump anyio from 4.11.0 to 4.14.2 in /libs/partners/openai (#40629) fix(openai): support GPT-6 request constraints (#40443)