Update copyright header

[clarasb]

This PR updates the copyright header.

Checklist:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/source/*
• Changes documented in CHANGES.md
• GitHub CI passes
• AppVeyor CI passes
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.53%. Comparing base (0e576ea) to head (33d19cc).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1208   +/-   ##
=======================================
  Coverage   89.53%   89.53%           
=======================================
  Files         280      280           
  Lines       21655    21655           
=======================================
  Hits        19389    19389           
  Misses       2266     2266           

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