Small incompatibility with Python 3.14

[frenzymadness]

This is no longer allowed in Python 3.14:

boolean.py/boolean/boolean.py

Line 868 in 431e522

if lt is NotImplemented:

According to https://docs.python.org/3.14/whatsnew/3.14.html:

Using NotImplemented in a boolean context will now raise a TypeError. It had previously raised a DeprecationWarning since Python 3.9. (Contributed by Jelle Zijlstra in gh-118767.)

[hroncok]

It's actually the line bellow:

boolean.py/boolean/boolean.py

Lines 868 to 869 in 431e522

	if lt is NotImplemented:
	return not self.__lt__(other)

That causes this.

See the test failure:

    def __gt__(self, other):
        lt = other.__lt__(self)
        if lt is NotImplemented:
>           return not self.__lt__(other)
E           TypeError: NotImplemented should not be used in a boolean context