Fix CI

[konstntokas]

Fix CI due to some pandas update of time frequency. The frequency hour "H" needs to be given with "h".

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/
• Changes documented in CHANGES.md
• CI checks pass
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.85%. Comparing base (edcee1b) to head (483d8f4).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files          22       22           
  Lines        2183     2183           
=======================================
  Hits         2158     2158           
  Misses         25       25           

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