Schedule terraform updates to once a month (#659)
Schedule terraform updates to once a month (#659)

Documentation for Renovate Bot's support for scheduling:
* https://docs.renovatebot.com/noise-reduction/
* https://docs.renovatebot.com/presets-schedule/
* https://docs.renovatebot.com/config-presets/#how-to-use-preset-configs
GoogleCloudPlatform/solution-acceleration-toolkit,GoogleCloudPlatform/solution-acceleration-toolkit