Add `std::` prefix #30

Job	Run time
Generate build matrix for Freestanding CI	5s
Clang-18 (x86-64) C++23 fmtlib none Release	5m 46s
Clang-18 (x86-64) C++23 std::format none Release	3m 52s
GCC-14 C++23 fmtlib none Debug	2m 37s
GCC-14 C++23 fmtlib none Release	2m 1s
GCC-14 C++23 std::format none Debug	2m 19s
GCC-14 C++23 std::format none Release	2m 4s
	18m 44s

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