Fix cppcheck 1.5.1 warning #4755
Description
In #4753, a new warning was raised by the new Cppcheck version:
include/nlohmann/detail/output/serializer.hpp:835:36: warning: %g in format string (no. 2) requires ‘double’ but the argument type is ‘number_float_t’. [invalidPrintfArgType_float]
std::ptrdiff_t len = (std::snprintf)(number_buffer.data(), number_buffer.size(), “%.*g”, d, x);
^
We need to check whether to suppress or fix it.