Bump prismjs from 1.24.1 to 1.25.0 in /example

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.24.1 to 1.25.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.24.1...v1.25.0)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-type: direct:production
...

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

Author: dependabot[bot]

example/package-lock.json

@@ -12,7 +12,7 @@
     "core-js": "^3.6.5",
     "katex": "^0.12.0",
     "nuxt": "^2.14.12",
-    "prismjs": "^1.22.0",
+    "prismjs": "^1.25.0",
     "vue-katex": "^0.5.0"
   },
   "devDependencies": {