Add support for Gcc16

[Twon]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.15%. Comparing base (d63f730) to head (bdf94e2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #484   +/-   ##
=======================================
  Coverage   98.15%   98.15%           
=======================================
  Files         164      164           
  Lines        3461     3461           
  Branches       68       68           
=======================================
  Hits         3397     3397           
  Misses         64       64           

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[Twon]

The issue is we need to build with the C++26 flag (but currently this is set ot C++23 in the CMake). To fix this, some builds need to build under C++23 and some under C++26, so there needs to be a check for which language version the compiler supports.