Add Clang 19 to CI

[justsmth]

Description of changes:

• Add clang-19 to our CI.
• Switch the pedantic test from clang-18 to clang-19.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.89%. Comparing base (ab8953b) to head (ab44859).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1998   +/-   ##
=======================================
  Coverage   78.89%   78.89%           
=======================================
  Files         595      595           
  Lines      102451   102451           
  Branches    14527    14527           
=======================================
+ Hits        80827    80829    +2     
+ Misses      20976    20970    -6     
- Partials      648      652    +4     

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