[python] Introduce backports.zstd dependency to fix fastavro reader exception for ManifestListManager#7834
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…xception for ManifestListManager
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Purpose
On Python versions below 3.14, fastavro uses
backports.zstdfor the zstandard Avro codec. Without that package, reading zstd-compressed manifest lists withManifestListManager.readcan fail with a confusing “missing codec / install backports.zstd” style error, especially in slim or Ray-like environments where optional deps are omitted. Therefore introducebackports.zstd(with a Python < 3.14 marker) topaimon-python/dev/requirements.txtso that local and CI-style dev installs include the codec backend needed for zstd manifest list I/O.Close #7833.
Tests
ManifestListManagerTest::test_zstd_manifest_list_fastavro_requires_backports_zstd.