homepage: backstage v1.45.3 version bump

Author: Eswaraiahsapram

workspaces/homepage/packages/app/src/index.tsx

@@ -16,7 +16,7 @@
 
 import '@backstage/cli/asset-types';
 import ReactDOM from 'react-dom/client';
-import '@backstage/ui';
+import '@backstage/ui/css/styles.css';
 import App from './App';
 
 ReactDOM.createRoot(document.getElementById('root')!).render(<App />);