fix(utils): prefer header-only fmt and spdlog targets #14

Job	Run time
Valgrind Checks	47s
Static Analysis	57s
Standalone Package Export Check	41s
Runtime Smoke Checks	43s
Build (clang, header_only=OFF, examples=ON, provider=fallback)	27s
Configuration Coverage	29s
Build (clang, header_only=ON, examples=OFF, provider=system)	26s
Build (clang, header_only=OFF, examples=ON, provider=system)	45s
Build (clang, header_only=OFF, examples=OFF, provider=fallback)	31s
Build (clang, header_only=ON, examples=OFF, provider=fallback)	32s
Build (clang, header_only=OFF, examples=OFF, provider=system)	30s
Build (clang, header_only=ON, examples=ON, provider=system)	24s
Build (gcc, header_only=ON, examples=ON, provider=fallback)	21s
Build (gcc, header_only=OFF, examples=ON, provider=fallback)	25s
Build (gcc, header_only=OFF, examples=ON, provider=system)	40s
Build (gcc, header_only=OFF, examples=OFF, provider=fallback)	26s
Build (gcc, header_only=ON, examples=OFF, provider=system)	27s
Build (clang, header_only=ON, examples=ON, provider=fallback)	33s
Build (gcc, header_only=ON, examples=OFF, provider=fallback)	27s
Build (gcc, header_only=OFF, examples=OFF, provider=system)	32s
Build (gcc, header_only=ON, examples=ON, provider=system)	27s
Utils Strict CI Summary	-1s
	11m 29s

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