chore(deps-dev): bump vue-tsc from 1.8.20 to 1.8.21 in /example

Bumps [vue-tsc](https://github.com/vuejs/language-tools/tree/HEAD/packages/tsc) from 1.8.20 to 1.8.21.
- [Release notes](https://github.com/vuejs/language-tools/releases)
- [Changelog](https://github.com/vuejs/language-tools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/language-tools/commits/v1.8.21/packages/tsc)

---
updated-dependencies:
- dependency-name: vue-tsc
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

example/package.json

@@ -18,7 +18,7 @@
     "typescript": "^5.2.2",
     "vite": "^3.2.7",
     "vite-plugin-windicss": "^1.9.1",
-    "vue-tsc": "^1.8.20",
+    "vue-tsc": "^1.8.21",
     "windicss": "^3.5.6"
   }
 }