fix: for incompatibly old models, just say downgrade everyvoice

[joanise]

See EveryVoiceTTS/FastSpeech2_lightning#156

Fixes #854

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
everyvoice/model/feature_prediction/FastSpeech2_lightning	0% smaller

[github-actions]

CLI load time: 0:00.26
Pull Request HEAD: 1fbde1870610ad86918ad1dae70e85020207f60a

Imports that take more than 0.1 s:
import time: self [us] | cumulative | imported package
import time:      7207 |     226534 | everyvoice.cli
import time:      5414 |     139273 |   rich.markdown
import time:      4633 |     235575 | typer.rich_utils

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.22%. Comparing base (5785e63) to head (1fbde18).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #856   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files          51       51           
  Lines        4710     4710           
  Branches      700      700           
=======================================
  Hits         4014     4014           
  Misses        535      535           
  Partials      161      161           

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