`np.float_` will be hard error in NumPy 2.0

[zm711]

Hey Alessio,

There's one more hard error coming in NumPy 2.0 where np.float_ will no longer be allowed. I didn't want to touch it in this function

https://github.com/SpikeInterface/MEArec/blob/c2f394abf24be1341ba59a2ca0fbadafd05ae383/src/MEArec/tools.py#L769

because you might need to jump through some hoops to keep backward compatibility along with forward compatibility, but just wanted to put it on your radar.