explicitly specify build-backend

[pastalian]

setuptools.build_meta:__legacy__ will be used if build-backend is not specified. Use setuptools.build_meta instead.

https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/#fallback-behaviour
https://pydocbrowser.github.io/setuptools/latest/setuptools.build_meta._BuildMetaLegacyBackend.html

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.88%. Comparing base (64680d5) to head (1fa2a04).
Report is 20 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files           3        3           
  Lines         360      360           
=======================================
  Hits          320      320           
  Misses         40       40           

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