fix(Tizen): Use a specific Docker image tag
fix(Tizen): Use a specific Docker image tag

This should help avoid issues if incompatibilities arise between
different versions of Docker images and Tizen WebDriver Server
modules.

shaka-project/generic-webdriver-server,shaka-project/generic-webdriver-server,shaka-project/generic-webdriver-server,shaka-project/generic-webdriver-server,shaka-project/generic-webdriver-server