ci: `import_std` now checks if at least C++23 is being used #67

Job	Run time
Generate build matrix for Conan CI	5s
fmtlib gsl-lite C++20 Apple Clang 15 Debug	6h 0m 23s
fmtlib none C++20 Apple Clang 15 Release	6h 0m 22s
fmtlib gsl-lite C++20 Clang-16 (x86-64) Debug	9m 13s
fmtlib none C++20 Clang-16 (x86-64) Release	9m 46s
fmtlib none C++20 Clang-17 (x86-64) Debug	11m 37s
std::format gsl-lite C++20 Clang-17 (x86-64) Debug	10m 39s
std::format gsl-lite C++20 Clang-18 (arm64) Debug	7m 22s
fmtlib none C++23 Clang-18 (arm64) Release	4m 45s
std::format gsl-lite C++20 Clang-18 (x86-64) Debug	12m 32s
std::format none C++23 Clang-18 (x86-64) Debug	11m 16s
fmtlib gsl-lite C++20 GCC-12 Debug	5m 4s
fmtlib ms-gsl C++20 GCC-12 Release	5m 26s
fmtlib ms-gsl C++23 GCC-12 Debug	5m 4s
std::format gsl-lite C++20 GCC-13 Debug	6m 48s
std::format none C++20 GCC-13 Release	6m 36s
fmtlib none C++20 GCC-14 Release	5m 54s
std::format gsl-lite C++20 GCC-14 Debug	5m 57s
fmtlib gsl-lite C++20 MSVC 14.4 Debug	2m 47s
std::format gsl-lite C++20 MSVC 14.4 Debug	1m 31s
Promote Conan package	0s
	14h 3m 7s

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