ci: another try to exclude runs in a matrix #1307

Job	Run time
std::format C++20 GCC-13 Release	38s
std::format C++20 GCC-13 Debug	41s
std::format C++20 Clang-16 Release	44s
std::format C++20 Clang-16 Debug	43s
std::format C++20 Clang-17 Release	1m 28s
std::format C++20 Clang-17 Debug	57s
std::format C++20 Apple Clang 15 Release	48s
std::format C++20 Apple Clang 15 Debug	44s
std::format C++23 GCC-13 Release	40s
std::format C++23 GCC-13 Debug	41s
std::format C++23 Clang-16 Release	44s
std::format C++23 Clang-16 Debug	41s
std::format C++23 Clang-17 Release	1m 4s
std::format C++23 Clang-17 Debug	1m 3s
std::format C++23 Apple Clang 15 Release	51s
std::format C++23 Apple Clang 15 Debug	41s
fmtlib C++20 GCC-12 Release	37s
fmtlib C++20 GCC-12 Debug	32s
fmtlib C++20 GCC-13 Release	42s
fmtlib C++20 GCC-13 Debug	32s
fmtlib C++20 Clang-16 Release	1m 15s
fmtlib C++20 Clang-16 Debug	1m 5s
fmtlib C++20 Clang-17 Release	1m 2s
fmtlib C++20 Clang-17 Debug	55s
fmtlib C++20 Apple Clang 15 Release	53s
fmtlib C++20 Apple Clang 15 Debug	59s
fmtlib C++23 GCC-12 Release	39s
fmtlib C++23 GCC-12 Debug	32s
fmtlib C++23 GCC-13 Release	38s
fmtlib C++23 GCC-13 Debug	31s
fmtlib C++23 Clang-16 Release	1m 5s
fmtlib C++23 Clang-16 Debug	58s
fmtlib C++23 Clang-17 Release	58s
fmtlib C++23 Clang-17 Debug	57s
fmtlib C++23 Apple Clang 15 Release	1m 5s
fmtlib C++23 Apple Clang 15 Debug	1m 12s
	30m 15s

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