use TaskEncodingDataset from local dataset module

[ArneBinder]

instead of deprecated version from pie-core, see ArneBinder/pie-core#61

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.55%. Comparing base (445e457) to head (adf94b3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
- Coverage   78.31%   72.55%   -5.77%     
==========================================
  Files          32       32              
  Lines        2163     2164       +1     
  Branches      316      316              
==========================================
- Hits         1694     1570     -124     
- Misses        378      513     +135     
+ Partials       91       81      -10     

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