Update version for next release (v0.15.0)

[ellnix]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.54%. Comparing base (5450df2) to head (60fdcf9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #407   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files          13       13           
  Lines         775      775           
=======================================
  Hits          694      694           
  Misses         81       81           

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