fix: off-by-one error in RecursiveJsonSplitter.split_json#35649

Ethan T. (gambletan) wants to merge 1 commit intolangchain-ai:masterlangchain-ai/langchain:masterfrom

gambletan:fix/json-splitter-off-by-onegambletan/langchain:fix/json-splitter-off-by-oneCopy head branch name to clipboard