Fix Wold-style-cast error (#2125)

* Add Wold-style-cast to cmake flags
* Fix old style cast in catch_stats.hpp
* Fix old style cast in catch_stats.cpp

src/catch2/benchmark/detail/catch_stats.cpp

@@ -182,7 +182,7 @@ namespace Catch {
                     double k0 = -n * nd;
                     double k1 = sb2 - n * sg2 + nd;
                     double det = k1 * k1 - 4 * sg2 * k0;
-                    return (int)(-2. * k0 / (k1 + std::sqrt(det)));
+                    return static_cast<int>(-2. * k0 / (k1 + std::sqrt(det)));
                 };
 
                 auto var_out = [n, sb2, sg2](double c) {

src/catch2/benchmark/detail/catch_stats.hpp

@@ -102,7 +102,7 @@ namespace Catch {
 
                 double accel = sum_cubes / (6 * std::pow(sum_squares, 1.5));
                 int n = static_cast<int>(resample.size());
-                double prob_n = std::count_if(resample.begin(), resample.end(), [point](double x) { return x < point; }) / (double)n;
+                double prob_n = std::count_if(resample.begin(), resample.end(), [point](double x) { return x < point; }) / static_cast<double>(n);
                 // degenerate case with uniform samples
                 if (prob_n == 0) return { point, point, point, confidence_level };