(dataset) remove lru_cache

[epappas]

Description

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❌ Your project status has failed because the head coverage (48.55%) is below the target coverage (85.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##              dev     #342      +/-   ##
==========================================
- Coverage   48.61%   48.55%   -0.06%     
==========================================
  Files          17       17              
  Lines        2952     2949       -3     
==========================================
- Hits         1435     1432       -3     
  Misses       1517     1517              

Files with missing lines	Coverage Δ
src/tplr/r2_dataset.py	76.43% <ø> (-0.20%)	⬇️

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