[clang-tidy] Replace C style casts with C++ ones

Found with google-readability-casting

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/sort.cpp

@@ -99,7 +99,7 @@ void sort_projects (
 {
   std::map <std::string, int> allProjectsInt;
   for (auto& p : allProjects)
-    allProjectsInt[p.first] = (int) p.second;
+    allProjectsInt[p.first] = static_cast<int>(p.second);
   
   sort_projects (sorted, allProjectsInt);
 }