Don't rely on [] operator in random::uniform_from

libs/random/include/psemek/random/uniform.hpp

@@ -60,7 +60,7 @@ namespace psemek::random
 	{
 		if (container.empty())
 			throw std::runtime_error("cannot sample from empty container");
-		return container[uniform<std::size_t>(rng, 0, container.size() - 1)];
+		return *std::next(container.begin(), uniform<std::size_t>(rng, 0, container.size() - 1));
 	}
 
 }