update to support clang21 and libfmt12 support #126

Job	Run time
Windows (windows-2019, C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliar...	1s
Linux (arbmind/qbs-gcc:1.21.0-11)	50s
Linux (arbmind/qbs-clang-libstdcpp:1.24.0-15-12)	57s
Linux (arbmind/qbs-gcc:1.24.0-12)	40s
Linux (arbmind/qbs-clang:2.1.2-17, modules.cpp.cxxStandardLibrary:libc++ modules.cpp.staticLibrar...	1m 20s
Linux (arbmind/qbs-clang:1.21.0-14, modules.cpp.cxxStandardLibrary:libc++ modules.cpp.staticLibra...	53s
Linux (arbmind/qbs-gcc:2.1.2-13)	50s
Windows (windows-2022, C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Buil...	1m 59s
	7m 30s

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