Clean up compatibility with Clang 18 and earlier.

[andreasfertig]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.45%. Comparing base (f243226) to head (6a7eb68).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #695      +/-   ##
==========================================
- Coverage   97.45%   97.45%   -0.01%     
==========================================
  Files          21       21              
  Lines        6606     6562      -44     
==========================================
- Hits         6438     6395      -43     
+ Misses        168      167       -1     

Flag	Coverage Δ
insights-macos	96.50% <100.00%> (-0.01%)	⬇️
insights-ubuntu-amd64-libcxx-No	98.10% <100.00%> (+0.01%)	⬆️
insights-ubuntu-amd64-libcxx-Yes	98.08% <100.00%> (+0.01%)	⬆️
insights-ubuntu-arm64-libcxx-No	98.23% <100.00%> (+0.01%)	⬆️
insights-ubuntu-arm64-libcxx-Yes	98.21% <100.00%> (+0.01%)	⬆️

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