langchain==1.4.3

Changes since langchain==1.4.2 release(langchain): 1.4.3 (#40888) fix(langchain): sanitize cache settings for fallback models (#40886) feat(langchain): support Bedrock Mantle chat models in `init_chat_model` (#40837) fix(langchain): recognize GPT-6 structured output without profiles (#40844) docs(infra): fix AGENTS.md root setup guidance and package doc accuracy (#40794) fix(langchain): repair invalid tool calls in `create_agent` (#40530) chore(langchain): remove commented-out cohere extra (#40713) chore(deps): bump anyio from 4.11.0 to 4.14.2 in /libs/langchain_v1 (#40626)