fix(utils): save model to cpu

[34j]

Description of change

copilot:all

Pull-Request Checklist

• Code is up-to-date with the main branch
• This pull request follows Contributing.md
• This pull request links relevant issues as Fixes #0000
• pre-commit run -a passes with this change or ci passes
• poetry run pytest passes with this change or ci passes
• (There are new or updated unit tests validating the change)
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 19.24%. Comparing base (3f537b0) to head (d71781f).
⚠️ Report is 278 commits behind head on main.

Files with missing lines	Patch %	Lines
src/so_vits_svc_fork/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1149      +/-   ##
==========================================
- Coverage   19.25%   19.24%   -0.01%     
==========================================
  Files          39       39              
  Lines        3496     3497       +1     
  Branches      497      497              
==========================================
  Hits          673      673              
- Misses       2804     2805       +1     
  Partials       19       19              

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