Replace DUNE_DEPRECATED by [[deprecated]]

dune/elasticity/assemblers/feassembler.hh

dune/elasticity/assemblers/localadolcstiffness.hh

dune/elasticity/assemblers/localfestiffness.hh

dune/elasticity/materials/exphenckyenergy.hh

dune/elasticity/materials/henckyenergy.hh

dune/elasticity/materials/localintegralenergy.hh

dune/elasticity/materials/mooneyrivlinenergy.hh

dune/elasticity/materials/neohookeenergy.hh

dune/elasticity/materials/neumannenergy.hh

dune/elasticity/materials/stvenantkirchhoffenergy.hh

dune/elasticity/materials/sumenergy.hh