Add support for GCC14 detection

[nagayev]

Changelog: Fix: Add gcc 14 to default settings.yml.
Docs: Omit

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[CLAassistant]

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[memsharded]

Thanks for your contribution @nagayev

It would be important to double check that the default c++ standard is not being changed by this compiler version, I haven't seen anything in the release notes, but better be sure.

[memsharded]

It would be important to double check that the default c++ standard is not being changed by this compiler version, I haven't seen anything in the release notes, but better be sure.

@nagayev did you manage to check this? It would be great to double check it.

[nagayev]

@memsharded Yes. As I can see at
https://gcc.gnu.org/projects/cxx-status.html
the c++ 20 support is not full yet and the default version is c++17

[memsharded]

Page https://gcc.gnu.org/gcc-14/changes.html also doesn't refer any change in this respect