build: update OpenGL version to 4.6

src/main.cpp

@@ -295,7 +295,7 @@ int main() {
         exit(EXIT_FAILURE);        
     }
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
     GLFWwindow* window = glfwCreateWindow(800, 600, "Cubed", NULL, NULL);
     glfwMakeContextCurrent(window);