chore(servicemanagement): update the api

#### servicemanagement:v1

The following keys were changed:
- revision (Total Keys: 1)
- schemas.Endpoint (Total Keys: 1)
- schemas.MetricDescriptor.properties.unit (Total Keys: 1)
- schemas.Service (Total Keys: 1)
- schemas.Service.properties.configVersion (Total Keys: 1)
- schemas.Usage.properties.requirements (Total Keys: 1)

Author: yoshi-automation