Bug#1136919: getfem: FTBFS: FAIL plasticity_fin_strain_lin_hardening_plane_strain.py (exit status: 1)

[Konstantinos Poulios]

This python compatibility issue is fixed upstream in these commits

https://cgit.git.savannah.nongnu.org/cgit/getfem.git/commit/contrib/continuum_mechanics/plasticity_fin_strain_lin_hardening_plane_strain.py?id=5026081fc0b3fc608944180ba88922e056674134
https://cgit.git.savannah.nongnu.org/cgit/getfem.git/commit/contrib/continuum_mechanics/plasticity_fin_strain_lin_hardening_plane_strain.py?id=ab6c4d46ca3cb86679fc2a92c1db5dc371d21e54