chore: update LICENSE file

[ST-DDT]

This PR updates the year in the license file and removes the repeated LICENSE text.

This also fixes the GitHub License detection:

Before:

After (Screenshot is from a fork, so it looks slightly different):

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (637f81b) to head (e1292eb).
Report is 2 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3350   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files        2811     2811           
  Lines      217023   217023           
  Branches      942      942           
=======================================
  Hits       216972   216972           
  Misses         51       51