Release 4.0.3

[bdraco]

• Restores the MIT license metadata that was dropped during the pyproject.toml migration in modernize package setup using pyproject.toml file instead of setup.py #244, so packaging tools (and downstream consumers like Home Assistant's license check) again detect aiodns as MIT-licensed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.42%. Comparing base (8de8773) to head (9a182fe).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #251   +/-   ##
=======================================
  Coverage   98.42%   98.42%           
=======================================
  Files           5        5           
  Lines        1399     1399           
  Branches       73       73           
=======================================
  Hits         1377     1377           
  Misses         16       16           
  Partials        6        6           

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