change VS Code cppStandard to C++20
Change VS Code cppStandard
from c++17
to c++20
.
This is required for gcc13
builds which specify -std=c++20
and -DACTS_CONCEPTS_SUPPORTED
. The latter enables concept
definitions, which IntelliSense (and MSVC, which it uses) doesn't recognise without cppStandard
=c++20
.
I don't think this will cause a problem with gcc11
builds, and haven't noticed any issue so far. I leave it as a question for another place whether we should be building gcc13
with -std=c++20
at the moment, but this MR should be good already.