update to clang-format-21

[anonrig]

Upgrade to clang-format-21 and clang-tidy-21

[codspeed-hq]

CodSpeed Performance Report

Merging #1036 will degrade performances by 99.99%

_{Comparing yagiz/clang-format-21 (72cd08f) with main (236e519)}

Summary

❌ 1 regression
✅ 18 untouched
⏩ 3 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	BasicBench_whatwg	31.7 µs	213,731.8 µs	-99.99%

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[anonrig]

@CarlosEduR would you mind taking a look at BasicBench_whatwg benchmark? it's probably having the same exact issue...

[CarlosEduR]

@CarlosEduR would you mind taking a look at BasicBench_whatwg benchmark? it's probably having the same exact issue...

sure, I will take a look

[CarlosEduR]

The lint and format pipeline failed, looks like clang++-21 isn't installed:

CMake Error at /usr/local/share/cmake-3.31/Modules/CMakeDetermineCXXCompiler.cmake:48 (message):
  Could not find compiler set in environment variable CXX:

  clang++-21.