Make default start year 2025

[jdebacker]

This PR updates the ogphl_default_parameters.json to use 2025 as the model start year.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.54%. Comparing base (b3e53e5) to head (953592f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
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  Coverage   70.54%   70.54%           
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  Files          12       12           
  Lines         275      275           
=======================================
  Hits          194      194           
  Misses         81       81           

Flag	Coverage Δ
unittests	70.54% <ø> (ø)

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