InjectedToolArg should be InjectedStore

[josiahcoad]

We'll that was a wasted hour trying to figure out something that ended up being a bug in this demo...

This is wrong in the tutorial:

async def upsert_memory(
    content: str,
    context: str,
    *,
    memory_id: Optional[uuid.UUID] = None,
    # Hide these arguments from the model.
    config: Annotated[RunnableConfig, InjectedToolArg],
    store: Annotated[BaseStore, InjectedToolArg],
):

should be:
store: Annotated[BaseStore, InjectedToolArg] -> store: Annotated[BaseStore, InjectedStore]

where
from langgraph.prebuilt import InjectedStore

Otherwise, you'll get an error about store not being available.