StructuredPrompt no longer mutates caller kwargs; Pydantic 2.14 compat fixed

Changes since langchain-core==1.5.3

release(core): 1.5.4 (#39592) fix(core): compat with pydantic 2.14 (#39328) fix(core): stop StructuredPrompt from mutating caller kwargs (#39174) fix(core): preserve flat tool args schema for RootModel runnables (#39307) fix(core): close internally created event loops in streaming tracers (#39222) chore: bump the minor-and-patch group across 3 directories with 7 updates (#39187) fix(core): preserve OpenAI file blocks (#39205) fix(core): document reserved argument names for tools (#39207) fix(core): handle injected args for subclasses of BaseTool (#39202) fix(core): respect include_injected=False with filter_args (#39200) fix(core): redact streaming callback options (#39179) fix(core): type text stream projections (#39170) chore(infra): add missing LICENSE files to publishable packages (#39146)