allow pie-core 0.3.0 and update lock file to that version

[ArneBinder]

see https://github.com/ArneBinder/pie-core/releases/tag/v0.3.0

This is breaking' because pie-core 0.3.0 was a breaking release and some of these elements re-exported:

• WithDocumentTypeMixin (alias: RequiresDocumentTypeMixin)
• (AnnotationPipeline|Model|TaskModule).(from_pretrained|save_pretrained)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.55%. Comparing base (ee5c587) to head (0826b5a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #493      +/-   ##
==========================================
- Coverage   78.32%   72.55%   -5.78%     
==========================================
  Files          32       32              
  Lines        2164     2164              
  Branches      316      316              
==========================================
- Hits         1695     1570     -125     
- Misses        378      513     +135     
+ Partials       91       81      -10     

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