ci: `import_std` now checks if at least C++23 is being used #1783

Job	Run time
Generate build matrix for CMake Test Package CI	4s
fmtlib gsl-lite C++20 Apple Clang 15 Debug	1s
fmtlib none C++20 Apple Clang 15 Release	1s
fmtlib gsl-lite C++20 Clang-16 (x86-64) Debug	1m 24s
fmtlib none C++20 Clang-16 (x86-64) Release	1m 8s
fmtlib none C++20 Clang-17 (x86-64) Debug	1m 39s
std::format gsl-lite C++20 Clang-17 (x86-64) Debug	1m 39s
std::format gsl-lite C++20 Clang-18 (arm64) Debug	1s
fmtlib none C++23 Clang-18 (arm64) Release	1s
std::format gsl-lite C++20 Clang-18 (x86-64) Debug	1m 49s
std::format none C++23 Clang-18 (x86-64) Debug	1m 55s
fmtlib gsl-lite C++20 GCC-12 Debug	43s
fmtlib ms-gsl C++20 GCC-12 Release	36s
fmtlib ms-gsl C++23 GCC-12 Debug	42s
std::format gsl-lite C++20 GCC-13 Debug	44s
std::format none C++20 GCC-13 Release	44s
fmtlib none C++20 GCC-14 Release	42s
std::format gsl-lite C++20 GCC-14 Debug	48s
fmtlib gsl-lite C++20 MSVC 14.4 Debug	2m 15s
std::format gsl-lite C++20 MSVC 14.4 Debug	1m 51s
	18m 47s

Provide feedback