langchain-anthropic 1.7.3

Changes since langchain-anthropic==1.7.2

release(anthropic): 1.7.3 (#40773) chore(model-profiles): refresh anthropic model profile data (#40772) fix(anthropic): auto-route with_structured_output to method="json_schema" for fable and opus 5.5 (#40766) chore(anthropic): update docs for Opus 5.5 (#40765) feat(anthropic): send mid-conversation SystemMessages in place (#40622) chore(deps): bump anyio from 4.11.0 to 4.14.2 in /libs/partners/anthropic (#40643)