upgrade from node-10 to node-12

There are CVE in node-10 which are resolved in node-12.

To do:

• change downstream Dockerfile build phase
• determine if `nodejs` needs to be installed at all in final image

Perhaps helpful (internal links):

https://code.engineering.redhat.com/gerrit/gitweb?p=grc-ui.git;a=blob;f=distgit/containers/grc-ui/Dockerfile.in;h=1297fa18109c732f309155be685bd83413e25234;hb=a2517826d44a24007c0f6c9f85d0c97e4329edc5

https://code.engineering.redhat.com/gerrit/gitweb?p=grc-ui.git;a=blob;f=distgit/containers/grc-ui/container.yaml.in;h=e7e282f72bec47cb7a733137e6dace21a716a726;hb=a2517826d44a24007c0f6c9f85d0c97e4329edc5