relax hard-pinned dependencies to minimum versions

[niradler]

All current dependencies use exact version pins (==). This makes chatterbox incompatible with any environment that needs a different version of the same package.

Most impactful: \ orch==2.6.0\ and \ orchaudio==2.6.0\ conflict with packages that require torch >=2.7 (e.g. whisperx requires \ orch>=2.7.1). An exact pin forces downstream users to maintain separate environments or apply override hacks in their build tooling.

Changes:

• \ orch==2.6.0\ → \ orch>=2.6.0\
• \ orchaudio==2.6.0\ → \ orchaudio>=2.6.0\
• 
  umpy>=1.24.0,<1.26.0\ →
  umpy>=1.24.0\ (numpy 2.x is ABI-compatible for the APIs chatterbox uses)
• All other ==\ pins → >=\ (librosa, transformers, diffusers, resemble-perth, conformer, safetensors, gradio, pykakasi)

The model weights and inference code are not version-sensitive to these exact pins. Switching to lower-bound constraints lets the resolver pick the best compatible version for the full environment.

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