Add more missing `std::` prefixes #25

Job	Run time
Generate build matrix for Freestanding CI	4s
Clang-18 (x86-64) C++23 fmtlib none Release	2m 53s
Clang-18 (x86-64) C++23 std::format none Release	3m 40s
GCC-14 C++23 fmtlib none Debug	2m 24s
GCC-14 C++23 fmtlib none Release	2m 7s
GCC-14 C++23 std::format none Debug	2m 25s
GCC-14 C++23 std::format none Release	2m 9s
	15m 42s

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