cmake: Update support for CMake 4.2

[stotko]

CMake 4.2 has been recently released. Keep up with the pace of introduced behavioral changes by bumping the maximum supported policy version.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.60%. Comparing base (5cf00b4) to head (0b916f6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #477   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files          33       33           
  Lines        2622     2622           
=======================================
  Hits         2533     2533           
  Misses         89       89           

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