Changes since langchain-anthropic==0.3.18
release(anthropic): 0.3.19 (#32595)
chore: update references to use the latest version of Claude-3.5 Sonnet (#32594)
fix(anthropic): correct input_token count for streaming (#32591)
fix(anthropic): clean up null file_id fields in citations during message formatting (#32592)
revert(anthropic): streaming token counting to defer input tokens until completion (#32587)
fix(anthropic): sanitize tool use block when taking directly from content (#32574)
fix(anthropic): streaming token counting to defer input tokens until completion (#32518)
fix(anthropic): Add proxy (#32409)
feat(anthropic): support cache_control as a kwarg (#31523)
fix(anthropic): update test model names and adjust token count assertions in integration tests (#32422)
docs(anthropic): add documentation for extended context windows in Claude Sonnet 4 (#32517)
feat: port various nit changes from wip-v0.4 (#32506)