Update an existing DatasetSource.

• id (str): Optional, ID of the dataset source.
• dataset_id (str): Optional, ID of the dataset. The dataset must already exist.
• source_id (UUID): Optional, Unique Identifier(UUID) of the source data. The source must already exist.
• folder (str or None): Optional, Path within the bucket to ingest data from.
• query (str or None): Optional, Query statement to retrieve data.
• ingest_type (IngestType): Optional, Type of data ingestion. Default is IngestType.INSERT.