B doctest fix for Visual Studio

https: //github.com/doctest/doctest/pull/258
Co-Authored-By: Llewellyn Falco <isidore@users.noreply.github.com>

lib/doctest.2.3.3.hpp

@@ -3432,7 +3432,7 @@ Approx& Approx::scale(double newScale) {
 bool operator==(double lhs, const Approx& rhs) {
     // Thanks to Richard Harris for his help refining this formula
     return std::fabs(lhs - rhs.m_value) <
-           rhs.m_epsilon * (rhs.m_scale + std::max(std::fabs(lhs), std::fabs(rhs.m_value)));
+           rhs.m_epsilon * (rhs.m_scale + std::max<double>(std::fabs(lhs), std::fabs(rhs.m_value)));
 }
 bool operator==(const Approx& lhs, double rhs) { return operator==(rhs, lhs); }
 bool operator!=(double lhs, const Approx& rhs) { return !operator==(lhs, rhs); }