remove fsspec constraint from dependencies

[ArneBinder]

since it is soon covered in pie-datasets, see ArneBinder/pie-datasets#198

breaking since it does not enforce dependency constraints anymore

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.55%. Comparing base (1890594) to head (d64cde9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #495      +/-   ##
==========================================
- 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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