Bump Dumps PySpark jobs to use Iceberg 1.6.1
Follow up to !837 (merged), as we need Iceberg 1.6.1 to pickup https://github.com/apache/iceberg/pull/9101.
Bug: T369868
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Follow up to !837 (merged), as we need Iceberg 1.6.1 to pickup https://github.com/apache/iceberg/pull/9101.
Bug: T369868