Change trapz and cumtrapz to trapezoid and cumulative_trapezoid for Python >=3.11

The trapz and cumtrapz functions for the integration are changed to trapezoid and cumulative_trapezoid functions, which should do the same in newer versions of scipy as described in the official documentation.

trapz: https://docs.scipy.org/doc/scipy-0.10.1/reference/generated/scipy.integrate.trapz.html trapezoid: https://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.trapezoid.html

similarly for the cumulative functions.