Bump Kotlin to 2.3.0

[lppedd]

As per title.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.93%. Comparing base (79b80e1) to head (1fb6ba2).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #155   +/-   ##
=========================================
  Coverage     85.93%   85.93%           
  Complexity      216      216           
=========================================
  Files            29       29           
  Lines           633      633           
  Branches        117      117           
=========================================
  Hits            544      544           
  Misses           60       60           
  Partials         29       29           

Flag	Coverage Δ
unittests	85.93% <ø> (ø)

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