Support net9.0 and remove netcoreapp3.1

[gdlcf88]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.81%. Comparing base (0f4877b) to head (9169dfc).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   84.81%   84.81%           
=======================================
  Files          99       99           
  Lines        2410     2410           
  Branches      184      184           
=======================================
  Hits         2044     2044           
  Misses        312      312           
  Partials       54       54           

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