Update node version for learner_portal.
Update node version for learner_portal.

mitodl/configuration,EDUlib/configuration,appsembler/configuration,edx/configuration,EDUlib/configuration,edx/configuration,appsembler/configuration,stvstnfrd/configuration,EDUlib/configuration,mitodl/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,appsembler/configuration,mitodl/configuration,arbrandes/edx-configuration,mitodl/configuration,EDUlib/configuration,EDUlib/configuration,stvstnfrd/configuration,stvstnfrd/configuration,stvstnfrd/configuration,edx/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,edx/configuration,appsembler/configuration,stvstnfrd/configuration