Fix: do link with stdc++fs when using GCC 8

[rmisev]

See: https://gitlab.kitware.com/cmake/cmake/-/issues/17834

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.66%. Comparing base (a46ab3a) to head (4179c22).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          16       16           
  Lines        2671     2671           
  Branches      424      424           
=======================================
  Hits         2662     2662           
  Misses          9        9           

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