Regression: np.set printoptions started returning a value

Regression: np.set printoptions started returning a value: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). After upgrading numpy I noticed that np.set printoptions(...) no longer returns None — it now returns some object back to the caller. As far as I know this…

The task

After upgrading numpy I noticed that `np.set_printoptions(...)` no longer returns `None` — it now returns some object back to the caller. As far as I know this function has always been a "side-effect only" call that returns nothing, and a lot of existing code (and doctests) rely on that.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.