[kiali] bump Go version to one that is maintained

We need to move to a newer version of Go.

See: https://github.com/kiali/kiali/pull/3780

This means we need to change these for our rpm builds:

• http://pkgs.devel.redhat.com/cgit/rpms/openshift-istio-kiali/tree/kiali.spec?h=rhossm-1.1-rhel-7#n4
• http://pkgs.devel.redhat.com/cgit/rpms/openshift-istio-kiali/tree/kiali.spec?h=rhossm-2.0-rhel-8#n4