langchain-openai==1.2.1

Changes since langchain-openai==1.2.0

hotfix: bump min core versions (#36996) release(openai): 1.2.1 (#36995) fix(openai): add gpt-5.5 pro to Responses API check (#36994) feat(core): add content-block-centric streaming (v2) (#36834) chore(model-profiles): refresh model profile data (#36982)