Human-in-the-loop middleware gains interrupt_mode and when predicate

Changes since langchain==1.3.2

release(langchain): 1.3.3 (#37843) chore(langchain): bump langgraph to 1.2.4 (#37857) chore(langchain): loosen langgraph dep range (#37855) feat(langchain): project subagent runs onto typed run.subagents channel (#37739) feat(langchain): add interrupt_mode and when predicate to HumanInTheLoopMiddleware (#37579)