chore(deps): update piper-tts requirement from >=1.2.0 to >=1.6.0

[dependabot]

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

Release notes

Sourced from piper-tts's releases.

v1.6.0

• Add Hebrew phonemizer using Nakdimon

Changelog

Sourced from piper-tts's changelog.

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

• Moved development to OHF-Voice org
• Removed C++ code for now to focus on Python development
  • A C API libpiper written in C++ is planned
• Embed espeak-ng directly instead of using separate piper-phonemize library
• Change license to GPLv3
• Use Python stable ABI (3.9+) so only a single wheel per platform is needed
• Change Python API:

... (truncated)

Commits

• f04d52c Bump version
• fabceb6 Merge pull request #244 from OHF-Voice/synesthesiam-20260717-hebrew
• 751f279 Fix Hebrew shva-na/nach resolution (and drop buggy qamats heuristic)
• dd3f13b Add Hebrew phonemization (Nakdimon niqqud + rule-based IPA G2P)
• e2a4b1f More import fixes
• d5a67fb More importor fixes
• 21923d6 Add importor skip for onnx
• 92b7b65 Update CHANGELOG
• efb8aab Merge pull request #238 from OHF-Voice/synesthesiam-20260626-training-mpd
• f5fa7f7 Add infer_torch script
• Additional commits viewable in compare view

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[dependabot]

Superseded by #28.