Update copyright

[clarasb]

This PR update the Copyright header.

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (49baccb) to head (cd20de3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          75       75           
  Lines        2975     2975           
  Branches      432      432           
=======================================
  Hits         2958     2958           
  Misses          1        1           
  Partials       16       16           

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[forman]

Copyright must include the year in which the copyright was first expressed for an item, hence 2025, 2026, later, e.g., 2025 - 2028.