test_read_spark_written_puffin_dv fails on deprecated PuffinFile.to_vector

[daviddallakyan2005]

Apache Iceberg version

main (development)

Please describe the bug 🐞

integration-test fails on main and on every open PR, including #3801.

The job stops on tests/integration/test_deletes.py::test_read_spark_written_puffin_dv:

DeprecationWarning: Call to to_vector, deprecated in 0.12.0, will be removed in 0.13.0. Use deletion_vectors_from_puffin_file(...) instead.

pyproject.toml sets filterwarnings = ["error"], so the deprecation is a hard failure.

This started when #3476 added the Spark Puffin DV interop test. That test calls puffin.to_vector(), which #3491 already deprecated. Production code in pyiceberg/io/pyarrow.py already uses deletion_vectors_from_puffin_file(...).

Evidence:

• https://github.com/apache/iceberg-python/actions/runs/31931966520
• https://github.com/apache/iceberg-python/actions/runs/31907106260 (main)

Willingness to contribute

• I can contribute a fix for this bug independently