feat(bigquery): update the api

#### bigquery:v2

The following keys were added:
- resources.routines.methods.getIamPolicy (Total Keys: 12)
- resources.routines.methods.setIamPolicy (Total Keys: 12)
- schemas.Dataset.properties.externalCatalogDatasetOptions.$ref (Total Keys: 1)
- schemas.DifferentialPrivacyPolicy (Total Keys: 13)
- schemas.ExternalCatalogDatasetOptions (Total Keys: 5)
- schemas.ExternalCatalogTableOptions (Total Keys: 6)
- schemas.JoinRestrictionPolicy (Total Keys: 5)
- schemas.PartitionSkew (Total Keys: 5)
- schemas.PrivacyPolicy.properties.differentialPrivacyPolicy.$ref (Total Keys: 1)
- schemas.PrivacyPolicy.properties.joinRestrictionPolicy.$ref (Total Keys: 1)
- schemas.SerDeInfo (Total Keys: 6)
- schemas.SkewSource (Total Keys: 5)
- schemas.StagePerformanceStandaloneInsight.properties.partitionSkew (Total Keys: 2)
- schemas.StorageDescriptor (Total Keys: 6)
- schemas.Table.properties.externalCatalogTableOptions.$ref (Total Keys: 1)