config.tf: tco to 0.6.2.
config.tf: tco to 0.6.2.

Includes fix for missing dex TPR.

coreos/tectonic-installer,aknuds1/tectonic-installer,coreos/tectonic-installer,coreos/tectonic-installer,aknuds1/tectonic-installer,aknuds1/tectonic-installer,coreos/tectonic-installer,coreos/tectonic-installer,aknuds1/tectonic-installer,aknuds1/tectonic-installer