Update ui.number after changing its limits

[falkoschindler]

This PR solves an issue noticed by @eddie3ruff on #2743: The stepper buttons of a ui.number element didn't enforce the min and max values after changing these limits. Consider the following example:

number = ui.number('Number', max=0, value=0)

def raise_max():
    number.max += 1

ui.button('Raise max', on_click=raise_max)

After raising the max, the stepper wouldn't allow changing the value, even though it could be edited via the input field. By triggering an update at the end of the min and max property setters, this problem is solved.