chore: update copyright end year to 2026

[rich-iannone]

This PR updates the copyright end year to 2026 in the LICENSE file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.61%. Comparing base (a59301b) to head (035d2c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #804   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files          47       47           
  Lines        5773     5773           
=======================================
  Hits         5289     5289           
  Misses        484      484           

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