Upgrade Colab TF version to 1.13.1
Upgrade Colab TF version to 1.13.1

Change-Id: I4be598d3e07f8207c9a201afd13a2269eca7619c

google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian