Update PETSc URL in Dockerfile.
Update PETSc URL in Dockerfile.

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