Use specific versions of Ubuntu and add GCC 14 C++23 workflow

[rmisev]

• Some versions of compilers are only available in specific versions of Ubuntu, for example g++-9 is only available in ubuntu-22.04.
• The libstdc++ provided with GCC 14 supports std::generator, which is used in the test in test-url_search_params.cpp. See: https://gcc.gnu.org/gcc-14/changes.html

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.86%. Comparing base (ac26f14) to head (0f3e22e). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ======================================= Coverage 99.86% 99.86% ======================================= Files 14 14 Lines 2306 2306 Branches 383 383 ======================================= Hits 2303 2303 Misses 3 3 ```

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