deps: update piper-tts requirement from >=1.4 to >=1.6.1

[dependabot]

Updates the requirements on piper-tts to permit the latest version.

Changelog

Sourced from piper-tts's changelog.

1.6.1

• Run the g2pW model through piper.g2pw_onnx instead of g2pw.api, dropping torch (~750 MB installed) and requests from the zh extra
  • g2pw.api imports torch only to build padded tensors and iterate batches; the model itself already ran under onnxruntime
  • Also 1.5-2x faster, since it no longer forks DataLoader worker processes on every call
  • g2pW is still required, for its pinyin/bopomofo lookup tables

1.6.0

• Add Hebrew phonemizer using Nakdimon

1.5.0

• Add libpiper C++ CLI executable ported from the legacy Piper repository, plus a C++ test suite
• Fix libpiper builds on Windows (MSVC, MSYS2-GCC) and Windows CI
• Bump embedded espeak-ng version
• Add default speaker id for multi-speaker voices
• Add vowel clustering support (--data.vowel_clusters)
• Add in-memory patching for alignments
• Training: add MRD (Multi-Resolution STFT) discriminator, loss/MOS tracking with UTMOS, silence-trim fixes, and dataloader performance improvements
• Pass custom phoneme id map when training

1.4.2

• Fix pathvalidate dependency

1.4.1

• Add missing wheels

1.4.0

• Add Chinese phonemizer based on g2pW
  • Using a quantized version of the original model with quantize_dynamic
• Add --data.phoneme_type pinyin for Chinese phonemization using g2pW
• Add --data.phoneme_type text for using IPA phonemes directly (no espeak-ng)
• Add --model.vocoder_warmstart_ckpt <CHECKPOINT> to restore vocoder params only
• Add --data.dataset_type 'phoneme_ids' to train with pre-generated phoneme ids
  • Use --data.num_symbols <N> to set number of phonemes
  • Use --data.phonemes_path "/path/to/phonemes.json" for phoneme/id map
• Add --output-dir-naming option with timestamp (default) and text

1.3.1

• Add experimental support for alignments (see docs/ALIGNMENTS.md)
• Raw phonemes no longer split sentences
• Fix training for multi-speaker voices

1.3.0

... (truncated)

Commits

• 5a9a99d Bump version
• ae655b9 Merge pull request #269 from OHF-Voice/torch-free-g2pw
• 03ee769 Add license
• 677992e Run g2pW under onnxruntime without torch
• de74c88 Make libpiper formatting opt-in (#268)
• ffb6223 Merge pull request #265 from florian-h05/piper-jni
• b6ee920 README: Add piper-jni
• e7db87b Restored C building compatibility (#264)
• 9c724fe Added logic to realistically fail when Pinyin phoneme type is provided (#263)
• 00519c3 Updated code to use a bit less RAM (#262)
• Additional commits viewable in compare view

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