Restrict nodal_area.Hex20_3 test to newer versions of PETSc.
Restrict nodal_area.Hex20_3 test to newer versions of PETSc.

This test fails with a negative Jacobian on older versions of PETSc
since the changes in 3061bbd5d.

Refs #10906.

permcody/moose,laagesen/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,nuclear-wizard/moose,harterj/moose,bwspenc/moose,dschwen/moose,idaholab/moose,idaholab/moose,sapitts/moose,andrsd/moose,jessecarterMOOSE/moose,sapitts/moose,milljm/moose,bwspenc/moose,idaholab/moose,permcody/moose,milljm/moose,SudiptaBiswas/moose,milljm/moose,harterj/moose,sapitts/moose,permcody/moose,nuclear-wizard/moose,milljm/moose,lindsayad/moose,YaqiWang/moose,SudiptaBiswas/moose,YaqiWang/moose,lindsayad/moose,permcody/moose,andrsd/moose,dschwen/moose,harterj/moose,bwspenc/moose,laagesen/moose,nuclear-wizard/moose,andrsd/moose,dschwen/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,bwspenc/moose,lindsayad/moose,harterj/moose,bwspenc/moose,andrsd/moose,dschwen/moose,sapitts/moose,milljm/moose,idaholab/moose,idaholab/moose,dschwen/moose,lindsayad/moose,andrsd/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,laagesen/moose,laagesen/moose,YaqiWang/moose,lindsayad/moose,laagesen/moose,sapitts/moose,YaqiWang/moose,nuclear-wizard/moose,harterj/moose,jessecarterMOOSE/moose