[ci] Pass credentials into old content generation
[ci] Pass credentials into old content generation

This script should use our bot's credentials, otherwise we can easily
go over the API request limit which is tracked by (the Travis
machine's) IP address for unauthenticated requests.

googlei18n/noto-source,googlefonts/noto-source,googlefonts/noto-source,googlei18n/noto-source,googlei18n/noto-source,googlefonts/noto-source