修复声明但是没有使用的东西

src/App.tsx

@@ -81,7 +81,7 @@ const theme = createTheme({
 function App() {
   const [tabValue, setTabValue] = useState(0);
 
-  const handleTabChange = (event: React.SyntheticEvent, newValue: number) => {
+  const handleTabChange = (_event: React.SyntheticEvent, newValue: number) => {
     setTabValue(newValue);
   };