Use <generator> instead of <experimental/generator>

[rmisev]

GCC 14 adds support for std::generator to coroutines.

See: https://www.meetingcpp.com/blog/items/What-brings-an-upgrade-to-GCC-14-from-GCC-13-.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (ed47482) to head (ac26f14).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #72   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          14       14           
  Lines        2306     2306           
  Branches      383      383           
=======================================
  Hits         2303     2303           
  Misses          3        3           

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