Update `evolve_angles_backwards` default version to 'v2'
The purpose of this MR is to update the default version of the pesummary.gw.conversions.evolve.evolve_angles_backwards
from 'v1' to 'v2'. If an old version of lalsimulation
is installed, the default version is changed to 'v1'. This is related to lalsuite!1779 (merged).