Add missing write(uint32_t)

[oldnewthing]

This avoids an ambiguity between promotion to int64_t or uint64_t.

Sadly, we cannot just take all the arithmetic types with

template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
void write(T const& value)
{
   write(std::to_string(value));
}

because that conflicts with the template declaration for invocables.

This still doesn't cover ambiguity over smaller integral types like uint8_t, but whoever needs that can add it.