v2.5.1

• Disable ONNX Runtime telemetry (ORT_DISABLE_TELEMETRY=1). 1.29.0 turned it
  on for Linux and macOS, so piper was uploading trace events to Microsoft.
  Set ORT_DISABLE_TELEMETRY=0 to opt back in
• Add script/check_voices, which fails if the bundled voices.json differs
  from the upstream piper-voices copy, and run it on pull requests.
  script/check_voices --update refreshes the bundled file
• Update voices.json: 13 new voices, 11 updated
• Remove ja (OpenJTalk) from the Docker images for now. The extra is still
  available via pip install '.[ja]' or script/setup --ja
• Stop advertising voices whose phonemizer is not installed. Japanese and Thai
  need the ja and th extras, but the whole catalog was advertised
  regardless, so a client offered those voices and every request came back as
  an empty audio stream. Catalog voices are filtered by language; custom voices
  by the phoneme_type in their config, which also covers pinyin. Chinese
  cannot be filtered by language, since zh_CN-huayan-* are espeak voices that
  work without the zh extra. A --voice that cannot be phonemized is now an
  error at startup rather than silence on the first request
• Add requests to the th extra. tltk imports it from its package
  __init__ without declaring it, so pip install 'wyoming-piper[th]'
  produced an install where every Thai synthesis failed with
  ModuleNotFoundError: No module named 'requests'
• Download voices and voices.json through a .part file and an atomic
  rename. An interrupted transfer used to leave a truncated file in place, and
  since a voice is only re-downloaded when its file is missing or empty (sizes
  and hashes are deliberately not checked), it was never retried -- the voice
  stayed broken, or the catalog stayed unparseable, until the file was deleted
  by hand
• Fix a failed synthesis reporting the wrong error. Closing the wave writer
  before any audio was written raises # channels not specified, which
  replaced the original exception -- and since that exception is what becomes
  the Wyoming Error event, clients were told the wrong thing. A missing
  phonemizer now reports itself