Bump rules_go to 0.19.5 and Go to 1.13.1.
Bump rules_go to 0.19.5 and Go to 1.13.1.

PiperOrigin-RevId: 271664207

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor