Changes since langchain-core==1.5.4 release(core): 1.5.5 (#39655) fix(core): make abatch_iterate consistent with batch_iterate for None and zero size (#39367) fix(core): respect pydantic aliases when validating tool inputs (#39572) fix(core): issues in merging chunks (#39535) fix(core): handle v1 base model validation in async path (#39576) fix(core): handle tool descriptions for infer_schema=False (#39573) fix(core): clear usage metadata callback on exceptions in context manager (#39616) fix(core): handle falsy LLM and chat model caches (#39283) chore(core): add httpx as an explicit dep (#39612) fix(core): preserve non-str/non-dict items in `DictPromptTemplate` list values (#39588) fix(core): raise ValueError when explicit tool_outputs length mismatches tool_calls in tool_example_to_messages (#39142) fix(core): guard malformed Anthropic content blocks (#38670)