chore: upgrade to composition API

src/components/SWNewVersion.vue

@@ -8,28 +8,20 @@
   </transition>
 </template>
 
-<script lang="ts">
-import { defineComponent, ref, onMounted } from 'vue'
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
 import { addEventBusListener } from 'retrobus'
 
-export default defineComponent({
-  name: 'SWNewVersion',
-  setup() {
-    const newVersion = ref(false)
+const newVersion = ref(false)
 
-    onMounted(() => {
-      addEventBusListener('new-version', () => (newVersion.value = true), {
-        retro: true,
-        once: true
-      })
-    })
-
-    return {
-      newVersion,
-      reload: () => location.reload(true)
-    }
-  }
+onMounted(() => {
+  addEventBusListener('new-version', () => (newVersion.value = true), {
+    retro: true,
+    once: true
+  })
 })
+
+const reload = () => location.reload()
 </script>
 
 <style lang="scss" scoped>