Remove incorrect wheel requirement from pyproject.toml

[mgorny]

Remove the incorrect wheel dependency, as it is added by the backend automatically. Listing it explicitly in the documentation was a historical mistake and has been fixed since, see: https://github.com/pypa/setuptools/commit/f7d30a9529378cf69054b5176249e5457aaf640a

[codecov[bot]]

Codecov Report

Merging #122 (f4eda42) into main (1a6afd2) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #122   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines         3225      3223    -2     
  Branches       648       635   -13     
=========================================
- Hits          3225      3223    -2     

Impacted Files	Coverage Δ
ubelt/util_list.py	100.00% <0.00%> (ø)
ubelt/util_import.py	100.00% <0.00%> (ø)

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[Erotemic]

Thanks! I'll fix that elsewhere.

[mgorny]

Thanks!