graphics: serialize pipeline cache through its renderer owner

src/graphics/presentation/window/window.cpp

@@ -817,6 +817,7 @@ void WindowRun() {
 	EXIT_IF(g_window == nullptr);
 
 	g_window->Run();
+	Common::LockGuard lock(g_window->render_context->GetMutex());
 	g_window->render_context->GetPipelineCache().Save();
 }